The Acme Corporation is designing an IP telephony network using Cisco MCS 7845 Series servers, each one capable of supporting 7500 devices. The design must meet these requirements: Which configuration will meet Acme Corporation’s needs?

A.
Two Cisco Unified CallManager systems:
1 first node and TFTP server combined
1 primary subsequent node

B.
Three Cisco Unified CallManager systems:
1 first node and TFTP server combined
1 primary subsequent node
1 backup subsequent node

C.
Four Cisco Unified CallManager systems:
1 first node
1 TFTP server
1 primary subsequent node
1 backup subsequent node

D.
Five Cisco Unified CallManager systems:
1 first node
1 TFTP server
1 primary subsequent node
2 backup subsequent nodes