How does Fast Logoff in a Workspace Environment Management (WEM) infrastructure optimize the logoff experience for users?

A. Improves roaming profile synchronization performance on logoff

B. Allows processes to continue running in the background while user sessions appear to log off quickly

C. Terminates hung application processes within 10 seconds of logging off
D. Notifies the Delivery Controllers that pooled desktops are ready for assignment on logoff