Which is the essential installation requirement to deploy a Cisco Unified MeetingPlace failover Application Server in a customer network?

A.
Three IP addresses, one is shared between both primary and failover servers

B.
Four IP addresses, two are shared between both primary and failover servers

C.
Two IP addresses and one shared hostname for DNS resolutions for both primary and failover servers

D.
Three IP addresses, one is shared, and one shared hostname for DNS resolution for both primary and failover servers