which three actions should be taken?

While implementing Media Server and blade redundancy in Cisco Unified MeetingPlace , which three actions should be taken? (Choose three.)

A.
Add extra audio and video hardware with extra licenses as needed.

B.
Ensure that the VLAN segments for separate networks are bridged across data centers.

C.
Add extra audio and video hardware (no extra licenses are needed).

D.
Add extra hardware with the same capacity and model (one for each Application Server).