What are the network requirements when redundant Cisco Unified ICM servers are geographically distributed?

A.
The servers must be connected by a private network card and crossover cables.

B.
The public and private networks must share the same infrastructure.

C.
The servers must be connected by a private dedicated network with each server having a second NIC connected to a dedicated WAN link.

D.
The private network can coexist with the rest of the customer’s corporate network.