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 needs?

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

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

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

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