Scenario: A Citrix Administrator wants to add machines to a Delivery Group.

Scenario: A Citrix Administrator wants to add machines to a Delivery Group. The administrator has two machine catalogs containing unallocated machines. On the screen to choose machines from machine catalogs, the administrator can see that only one machine catalog is available.

A possible cause of this issue is that the machines in the unavailable machine catalog are ________. (Choose the correct option to complete the sentence.)