Explanation/Reference:
Explanation:
The Set-AzureRmVMDataDisk cmdlet modifies properties of a virtual machine data disk.
Syntax:
Set-AzureRmVMDataDisk
[-VM] <PSVirtualMachine>
[-Lun] <Int32>
[[-Caching] <CachingTypes>]
[[-DiskSizeInGB] <Int32>]
[<CommonParameters>]
The -caching parameter specifies the caching mode of the disk. The acceptable values for this parameter are:
ReadOnly

ReadWrite

The default value is ReadWrite. Changing this value causes the virtual machine to restart.
Incorrect Answers:
A: The Set-AzureRmVMOperatingSystem cmdlet sets operating system properties for a virtual machine.
You can specify logon credentials, computer name, and operating system type.
C: The Update-Disk cmdlet updates cached information about the specified Disk object only D: The Update-AzureDisk cmdlet changes the label that is associated with a disk in the disk repository of the current Azure subscription.
References: https://docs.microsoft.com/en-us/powershell/module/azurerm.compute/set- azurermvmdatadisk?view=azurermps-4.3.1