PowerShell cmdlets are updated regularly; if you have not installed the latest version or used the earlier versions, the values defined in the instructions might fail. You can run Get-Module - ListAvailable Az cmdlet to know the version of Azure PowerShell installed on your computer.
Option A is correct. Get-Module -ListAvailable Az is the right cmdlet to be used to know the version of Azure PowerShell installed on the system.
Option B is incorrect. Get-Module-AzList is not the right cmdlet.
Option C is incorrect. There is no command like Retrieve-Module -ListAvailable Az.
Option D is incorrect. There is no such cmdlet in Azure PowerShell.
Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/diagnose-network-routing- problem?WT.mc_id=modinfra-33046-thmaure
https://docs.microsoft.com/en-us/azure/vpn-gateway/point-to-site-how-to-radius- ps?WT.mc_id=modinfra-33046-thmaure