Which two phrases best describe the purposes of a CallManager group? (Choose two)

A.
Prioritized fail-over list for backup call processing

B.
Call processing load balancing

C.
Easy configuration of identical CallManagers

D.
Single configuration for CallManagers with common devices

E.
Prioritized list of gateways

Explanation:
Distributing Devices for Redundancy and Load Balancing Cisco CallManager groups provide both call processing redundancy and distributed call processing. How you distribute devices, device pools, and Cisco CallManagers among the groups determines the level of redundancy and load balancing in your system. In most cases, you would want to distribute the devices in a way that prevents the other Cisco CallManagers from becoming overloaded if one Cisco CallManager in the group fails
Reference:
http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_administration_guide_chapter09186 a