Which three of these options correctly describe the role of a subscriber in a Cisco CallManager cluster? (Choose three)

A.
Collects CDRs

B.
Replicates database to other Cisco CallManager servers

C.
Maintains read-only copies of the configuration database

D.
Maintains writeable copy of the configuration database

E.
Processes IP telephony calls

F.
Can have only one in a Cisco CallManager cluster