A Citrix Administrator discovers 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.