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:

(1) be cost-effective

(2) support up to 7500 phones

(3) provide a minimal level of redundancy

Which configuration will meet Ajax Corporation’s 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
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Cisco 642-447 Exam
1 backup subscriber

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

Explanation: