Your company has an Active Directory Domain Services (AD DS) domain that runs at the Windows Server 2008 functional level. All domain controllers run Windows Server 2008 R2 (Core Installation). You h ave a Remote Desktop Services infrastructure that includes a Remote Desktop Connection Broker (RD Connection Broker) server and aRemote Desktop Session Host (RD Session Host) server in redirection mode. You configure a virtual machine (VM) as a personal v irtual desktop for an employee. The Personal Virtual Desktop tab is not visible when you display the properties of the employee is user account. You need to assign a personal virtual desktop to the user account. What should you do?（）