Scenario: A Citrix Administrator needs to add machines to a Delivery group. The administrator has two Machine Catalogs containing unallocated machines. At the screen to choose machines from Machine Catalogs, the administrator sees only one Machine Catalog available.
What is a possible cause of this issue?
If the administrator sees only one Machine Catalog available when adding machines to a Delivery Group, one possible cause could be that the machines in the other catalog are in maintenance mode. When machines are in maintenance mode, they are unavailable for allocation to a Delivery Group until they are taken out of that state.
i think the answer is B
B is correct https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/install-configure/delivery-groups-create.html
A,C,D are false so B is correct