A CallManager cluster topology of Cisco MCS 7835s (each capable of supporting 2500 calls) is being designed for an IP telephony network. The cluster design must:
1) Support up to 3,000 phones
2) Provide a level of redundancy
3) Be cost effective
4) Support a very heavy streamed media file load.
Given those necessities, which of the following configurations requires the fewest number of CallManagers but still provides acceptable performance?

A.
Four: Publisher, TFTP server, and two Primaries

B.
Five: Publisher, TFTP server, two Primaries, and a Secondary (covering both Primaries)

C.
Four: combined Publisher and TFTP server, two Primaries, and a Secondary (covering both Primaries)

D.
Six: Publisher, TFTP server, two Primaries, two secondaries (one for each Primary)

E.
Six: Publisher, TFTP server, two Primaries, and a Secondary (covering both Primaries), and a Tertiary (covering both Primaries)

F.
Six: Publisher, TFTP server, two Primaries, two secondaries (one for each Primary), and two Tertiaries (one for each Primary)