For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time.
For all Virtual Machines that have two or more instances deployed in the same Availability Set or in the same Dedicated Host Group, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.95% of the time.
For any Single Instance Virtual Machine using Premium SSD or Ultra Disk for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%.
For any Single Instance Virtual Machine using Standard SSD Managed Disks for Operating System Disk and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least
99.5%.
For any Single Instance Virtual Machine using Standard HDD Managed Disks for Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 95%.

Explanation:
Box 1: No
You cannot add physical servers to the public cloud. You can only deploy virtual servers in the public cloud. You can extend a private cloud by deploying virtual servers in a public cloud. This would create a hybrid cloud.
Box 2: Yes
A hybrid cloud is a combination of a private cloud and public cloud. Therefore, to create a hybrid cloud, you must deploy resources to a public cloud.
Box 3: No.
It is not true that a private cloud must be disconnected from the Internet. Private clouds can be and most commonly are connected to the Internet. "Private cloud" means that the physical servers are managed by you. It does not mean that it is disconnected from the Internet.
References:
https://azure.microsoft.com/en-gb/overview/what-are-private-public-hybrid-clouds/

Explanation:
A stopped (deallocated) VM is offline and not mounted on an Azure host server. Starting a VM mounts the VM on a host server before the VM starts. As soon as the VM is mounted, it becomes chargeable. For this reason, you are unable to start a VM after a trial has expired.
Incorrect Answers:
You are not charged for Azure Active Directory user accounts so you can continue to create accounts.
You can access data that is already stored in Azure.
You can access the Azure Portal. You can also reactivate and upgrade the expired subscription in the portal.

Explanation:
Single sign-on is an authentication method that allows users to sign in using one set of credentials to login across applications. Single sign-on makes it easier to manage passwords and increases security capabilities.
Authorization is the process of establishing what level of access a legitimate user or service should have.
During sign-in, Conditional Access collects signals from the user, makes decisions based on those signals, and then enforces that decision by allowing or denying the access request or challenging for a multifactor authentication response.
Reference:
https://docs.microsoft.com/learn/modules/secure-access-azure-identity-services/3-what-is-azure- active-directory
https://docs.microsoft.com/learn/modules/secure-access-azure-identity-services/2-compare- authentication-authorization
https://docs.microsoft.com/learn/modules/secure-access-azure-identity-services/4-what-are-mfa- conditional-access

With Azure Cloud Shell, you can create virtual machines using Bash or PowerShell.
Azure Cloud Shell is an interactive, authenticated, browser-accessible shell for managing Azure resources. It provides the flexibility of choosing the shell experience that best suits the way you work, either Bash or PowerShell.
Reference:
https://docs.microsoft.com/en-us/azure/cloud-shell/quickstart
https://docs.microsoft.com/en-us/azure/cloud-shell/overview