Explanation:

Azure Load Balancers are offered in two SKUs - Basic and Standard - each with distinct capabilities, scalability, and configuration requirements as documented in Microsoft Azure Administrator documentation.
* LB1 - Basic Load Balancer (Basic SKU)The Basic Load Balancer is designed for small-scale, non- production workloads. It has certain limitations compared to the Standard SKU:
* The backend pool of a Basic Load Balancer can only include virtual machines in a single availability set or a single virtual machine scale set.
* This restriction ensures that the Basic Load Balancer maintains consistency and proper failover across VMs sharing the same availability set or scale set.
* It cannot span multiple availability sets or virtual networks.
Therefore, to load balance VMs using a Basic Load Balancer, those VMs must be created in the same availability set or virtual machine scale set.
# Correct Option for LB1: be created in the same availability set or virtual machine scale set.
* LB2 - Standard Load Balancer (Standard SKU)The Standard Load Balancer is designed for production- grade workloads and supports advanced features such as zone redundancy, secure by default configuration, and high scalability.
* It supports backend pools composed of virtual machines from different availability zones (in the same region) and multiple virtual machine scale sets.
* The only requirement is that all backend virtual machines must be connected to the same virtual network.
* Standard Load Balancer also supports both public and internal load balancing and provides richer metrics and diagnostic capabilities.
Therefore, for LB2 (Standard), the virtual machines only need to reside within the same virtual network, regardless of their availability sets or zones.
# Correct Option for LB2: be connected to the same virtual network.
Microsoft Azure Official Extract (summarized):
"For Basic Load Balancer, backend pool VMs must belong to the same availability set or virtual machine scale set. For Standard Load Balancer, backend pool members can be across availability zones and scale sets, but must be connected to the same virtual network." (From Microsoft Azure Administrator Study Guide - Load Balancer Configuration and Comparison; Azure Docs: azure.microsoft.com > Load Balancer SKUs Comparison.) Final Verified Answer:
# LB1: be created in the same availability set or virtual machine scale set
# LB2: be connected to the same virtual network

Azure Virtual Network (VNet) Peering is the Microsoft-recommended solution to enable seamless communication between two virtual networks, either within the same subscription or across different subscriptions, with minimal cost and administrative overhead.
According to the Microsoft Azure Administrator documentation, VNet Peering connects two virtual networks and allows resources in either VNet to communicate with each other using private IP addresses, just as if they were part of the same network. Traffic between peered VNets remains on the Microsoft backbone network, ensuring low latency, high bandwidth, and no data exposure to the public internet.
There are two types of peering supported:
* VNet Peering (intra-region): For virtual networks in the same Azure region.
* Global VNet Peering: For virtual networks in different Azure regions (for example, East US and West US).
In this scenario, VNet1 (East US, Sub1) and VNet2 (West US, Sub2) are in different regions and different subscriptions. Therefore, Global VNet Peering is the appropriate configuration. Peering can be established across subscriptions, provided that the subscriptions are associated with the same Azure Active Directory tenant or proper permissions exist between tenants.
Unlike VPN gateways or network virtual appliances, VNet peering does not require additional infrastructure or incur data transfer gateway costs, making it the lowest-cost and least administratively complex option.
Once configured, communication between VM1 in VNet1 and VM2 in VNet2 occurs over Microsoft's private backbone network, without public IPs or tunneling.

You can't delete a vault that contains backup data. So in this case at first you have to delete the backup of 'SQLD01' before you attempt to delete the vault.
Reference:
https://docs.microsoft.com/en-us/azure/backup/backup-azure-delete-vault

The Logic App Operator role only grants the ability to read, enable, disable, and run logic apps. It does not grant the ability to create logic apps. To create logic apps, you need to assign the Logic App Contributor role or a higher-level role such as Owner or Contributor. Then, References: [Built-in roles for Azure resources]
[Azure Logic Apps permissions and access control]

As App1 is public-facing we need an incoming security rule, related to the access of the web servers.
Scenario: You have a public-facing application named App1. App1 is comprised of the following three tiers: a SQL database, a web front end, and a processing middle tier.
Each tier is comprised of five virtual machines. Users access the web front end by using HTTPS only.
Topic 3, Contoso Ltd (Consulting Company)Case study
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Overview
General Overview
Contoso, Ltd. is a consulting company that has a main office in Montreal and branch offices in Seattle and New York.
Environment
Existing Environment
Contoso has an Azure subscription named Sub1 that is linked to an Azure Active Directory (Azure AD) tenant. The network contains an on-premises Active Directory domain that syncs to the Azure AD tenant.
The Azure AD tenant contains the users shown in the following table.

Sub1 contains two resource groups named RG1 and RG2 and the virtual networks shown in the following table.

User1 manages the resources in RG1. User4 manages the resources in RG2.
Sub1 contains virtual machines that run Windows Server 2019 as shown in the following table

No network security groups (NSGs) are associated to the network interfaces or the subnets.
Sub1 contains the storage accounts shown in the following table.

Requirements
Planned Changes
Contoso plans to implement the following changes:
Create a blob container named container1 and a file share named share1 that will use the Cool storage tier.
Create a storage account named storage5 and configure storage replication for the Blob service.
Create an NSG named NSG1 that will have the custom inbound security rules shown in the following table.

Associate NSG1 to the network interface of VM1.
Create an NSG named NSG2 that will have the custom outbound security rules shown in the following table.

Associate NSG2 to VNET1/Subnet2.
Technical Requirements
Contoso must meet the following technical requirements:
Create container1 and share1.
Use the principle of least privilege.
Create an Azure AD security group named Group4.
Back up the Azure file shares and virtual machines by using Azure Backup.
Trigger an alert if VM1 or VM2 has less than 20 GB of free space on volume C.
Enable User1 to create Azure policy definitions and User2 to assign Azure policies to RG1.
Create an internal Basic Azure Load Balancer named LB1 and connect the load balancer to VNET1/Subnet1 Enable flow logging for IP traffic from VM5 and retain the flow logs for a period of eight months.
Whenever possible, grant Group4 Azure role-based access control (Azure RBAC) read-only permissions to the Azure file shares.