The secondary Cisco Unity failover server can have the Exchange mailstore installed on-box under which conditions?

A.
Cisco Unity 5.0 voice mail only with Exchange Server 2000 or later.

B.
Cisco Unity 4.2 or later voice mail only with Exchange Server 2003.

C.
Cisco Unity 5.0 voice mail only with Exchange Server 2003.

D.
Cisco Unity 5.0 unified messaging with Exchange Server 2003.