Which method will most effectively provide management and monitoring failover for Cisco WAAS?

Which method will most effectively provide management and monitoring failover for Cisco WAAS?

A.
Use multiple Cisco WAE devices at the data center.

B.
Use a primary and a secondary Central Manager.

C.
Use multiple Cisco WAE devices at each client location.

D.
Use a Cisco CDM at the data center and a Cisco CDM at the furthest client location.