The Ajax 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:

* be cost-effective
* support up to 7500 phones
* provide a minimal level of redundancy

Which configuration will meet Ajax Corporation’s needs?

A.
five Cisco Unified Communications Manager servers: 1 publisher 1 TFTP server 1 primary subscriber 2 backup subscribers

B.
four Cisco Unified Communications Manager servers: 1 publisher 1 TFTP server 1 primary subscriber 1 backup subscriber

C.
two Cisco Unified Communications Manager servers: 1 publisher and TFTP server combined 1 primary subscriber

D.
three Cisco Unified Communications Manager servers: 1 publisher and TFTP server combined 1 primary subscriber 1 backup subscriber