You decide to deploy AVD session host VMs based on a preconfigured master image. The master image will be stored in a shared image gallery. 
You create a VM named Img1 to utilize as the master image. You install apps and apply configuration modifications to Img1. 
You need to make sure that the new session host VMs created based on Img11 have unique names and security identifiers. 
What would you do on Img1 before adding the image to the shared image gallery?

Answer options:

A.Run the rename-computer cmdlet from PowerShell.
B.Run the set computername command at the command prompt.
C.Run the sysprep command at the command prompt.
D.From the lock screen of the Windows device, apply a Windows Autopilot Reset.

Correct Answer: C 
System Preparation Tool (sysprep.exe) is a typical process that is run for resetting a Windows installation. Sysprep offers an "out of the box" experience by deleting all personal data and resetting multiple components. 
sysprep.exe is typically run for creating a template from which several other virtual machines having a specific configuration can be deployed. This template is known as a generalized image.
Option A is incorrect. The Rename-Computer cmdlet is used to rename a local or remote computer.
Option B is incorrect. Set computername is the incorrect command to run.
Option C is correct. You need to run the sysprep command at the command prompt to meet the goal.
Option D is incorrect. Performing a Windows Autopilot Reset won’t meet the goal.
Reference: 
To know more about how to Prepare a Windows VHD or VHDX to upload to Azure, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/virtual-machines/windows/prepare-for-upload-vhd-image#determine-when-to-use-sysprep