Explanation:

You can provide authorization credentials by using Azure Active Directory (AD), or by using a Shared Access Signature (SAS) token.
Box 1:
Both Azure Active Directory (AD) and Shared Access Signature (SAS) token are supported for Blob storage.
Box 2:
Only Shared Access Signature (SAS) token is supported for File storage.
Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-use-azcopy-v10

Azure Backup uses the Recovery Services vault to protect virtual machines by creating restore points stored in Azure. Before a virtual machine can be backed up, it must have the Azure Backup extension (also called VMBackup extension) properly installed and configured on the VM.
According to Microsoft Learn - "Back up and restore encrypted virtual machines" and "Back up Azure VMs with the Azure Backup service", the backup process for a VM requires the following:
"When you enable backup for an Azure virtual machine, the Azure Backup service installs an extension on the VM to coordinate the snapshot and backup process. If the extension is missing or not installed properly, backups cannot be triggered for that VM." Explanation of the Scenario You already have a Recovery Services vault protecting VM1 and VM2.
You now need to add VM3 and VM4 to the same vault for protection.
Before they can be added, you must ensure that:
The VMs are running in the same region as the Recovery Services vault (because a vault can only protect resources within its region).
The VMBackup extension is installed and registered on each VM.
If the backup extension is missing or not configured correctly, Azure Backup cannot communicate with the VM to take snapshots or register it in the vault.
Once the extension is properly configured, you can then enable backup from the Recovery Services vault without needing to create a new vault, policy, or storage account - because all those resources already exist and can be reused.
Other Options Explained
A). Create a new Recovery Services vault: # Not necessary unless the new VMs are in a different region from the existing vault.
C). Create a storage account: # Azure Backup automatically manages backup storage within the vault; no separate storage account is required.
D). Create a new backup policy: # Not needed unless you want a different backup schedule or retention. You can use the existing policy.
# Final Verified Answer:
B). Configure the extensions for VM3 and VM4.
Microsoft Learn Extract (Supporting Documentation):
"To enable Azure Backup for virtual machines, the Azure Backup extension must be installed. This extension coordinates the snapshot and backup process and is installed automatically when backup is enabled."
"If the extension is not installed, you must configure it before enabling protection." (Source: Microsoft Learn - Back up Azure VMs with the Azure Backup service, Azure Recovery Services vault overview)

Explanation:

In Azure App Service, a Web App must be hosted in an App Service Plan (ASP) that meets three key compatibility conditions:
The App Service Plan and the Web App must be in the same region.
The operating system (Windows or Linux) of the App Service Plan must match the Web App type.
The runtime stack of the Web App must be supported on the App Service Plan's OS.
Let's apply these rules to the scenario:
# App Service Plans:
Name
Operating System
Location
ASP1
Windows
West US
ASP2
Windows
Central US
ASP3
Linux
West US
# Web Apps:
Name
Runtime Stack
Location
WebApp1
NET Core 3.0
West US
WebApp2
ASP.NET 4.7
West US
1## WebApp1 (.NET Core 3.0, West US)
Region requirement: Must use an App Service Plan in West US # # ASP1 and ASP3 qualify.
Runtime requirement: .NET Core 3.0 supports both Windows and Linux App Service Plans.
(Microsoft Learn: ".NET Core apps can run on both Windows and Linux App Service plans.")
# Therefore, WebApp1 can use ASP1 (Windows, West US) or ASP3 (Linux, West US).
# Answer: ASP1 and ASP3 only
2## WebApp2 (ASP.NET 4.7, West US)
Region requirement: Must be in West US # # ASP1 and ASP3 qualify.
Runtime requirement: ASP.NET 4.7 is a Windows-only framework; it cannot run on Linux App Service Plans.
(Microsoft Learn: "ASP.NET (non-Core) apps require a Windows-based App Service Plan.")
# Therefore, only ASP1 (Windows, West US) is compatible.
# Answer: ASP1 only
# Final Verified Answers:
Web App
Compatible App Service Plans
WebApp1
ASP1 and ASP3 only
WebApp2
ASP1 only
Microsoft Documentation Extract (Azure App Service):
"App Service plans must be in the same region as the web app."
"Windows App Service plans host ASP.NET, .NET Core, and Node.js apps."
"Linux App Service plans host .NET Core, Node.js, Python, PHP, Java, and custom containers."
".NET Framework (ASP.NET 4.x) applications can only run on Windows-based App Service plans." Hence, the verified and Microsoft-official answer is:
# WebApp1 # ASP1 and ASP3 only
# WebApp2 # ASP1 only

In Azure DNS, delegating a subdomain (such as research.adatum.com) to another DNS server or DNS zone requires creating a Name Server (NS) record in the parent domain (adatum.com).
Here's how DNS delegation works according to the Microsoft Azure DNS documentation:
* The parent DNS zone (adatum.com) must contain an NS record set for the subdomain (research).
* This NS record points to the authoritative name servers of the child DNS zone (research.adatum.com).
* When a DNS query is made for any record under research.adatum.com, the DNS resolution process will follow the delegation and forward the query to the specified DNS servers.
Example configuration:
Record Type
Name
Value
NS
research
ns1-xx.azure-dns.com
ns2-xx.azure-dns.net
This delegation ensures that the subdomain research.adatum.com is managed independently, possibly by another team or subscription.
Other options:
* PTR record: Used for reverse DNS lookups, not for delegation.
* SOA record: Defines start of authority for a zone, not delegation.
* A record: Maps a name to an IP address, not for delegating zones.
# Final Verified Answer: B. Create an NS record named research in the adatum.com zone

Explanation: