Your company has an Active Directory Domain Services (AD DS) domain. All servers run Windows
Server 2008 R2. All client computers run Windows 7. Your environment includes Microsoft
Enterprise Desktop Virtualization (MED-V). You update the MED-V Workspace virtual machines
(VMs) several times and notice that the server is running out of disk space. You need to configure
the Workspace to minimize the disk space requirements. What should you do?

A.
Configure the Workspace as revertible.

B.
Set an expiration date for the Workspace.

C.
Specify the number of image versions to keep.

D.
Specify that clients should use the Trim Transfer when downloading the images.

Explanation:
http://technet.microsoft.com/en-us/library/ff433598.aspx