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

A.	A Cisco Unified Communications Manager group is a prioritized list of (one or more) call- processing and application servers.
B.	A single Cisco Unified Communications Manager group can exist in a single cluster.
C.	Each call-processing server can be assigned to a single Cisco Unified Communications Manager group.
D.	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.