You plan to deploy Windows Virtual Desktop. The deployment will use existing virtual machines.

You create a Windows Virtual Desktop host pool.

You need to ensure that you can add the virtual machines to the host pool.

What should you do first?

A. Register the Microsoft.DesktopVirtualization provider.

B. Generate a registration key.

C. Run the Invoke-AzVMRunCommand cmdlet.

D. Create a role assignment.

Reference:
https://docs.microsoft.com/en-us/azure/virtual-desktop/create-host-pools-azure-marketplace