A Citrix Administrator notices that several virtual desktops in Citrix Studio are unregistered.
Click the Exhibit button to view a screenshot of the XenCenter Console.
Based on the information in the screenshot, why are the virtual desktops unregistered?
A. XenServer is NOT a pool member.
B. XenServer is in maintenance mode.
C. The virtual machines are NOT running.
D. The virtual machines have been suspended.