What are the characteristics of a Cisco Unified Communications Manager group?

A.
Each call-processing server can be assigned to a single Cisco Unified Communications Manager group.

B.
A Cisco Unified Communications Manager group is a prioritized list of (one or more) callprocessing and
application servers.

C.
Each device has to have a Cisco Unified Communications Manager group assigned, which will determine
the primary and backup servers to which it can register.

D.
A single Cisco Unified Communications Manager group can exist in a single cluster.