If necessary, how can it realize?

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Customers are running POWER7+ server, the HMC7042-CR4 management, firmware V7R7.9.0.Customers will purchase a POWER E870 server, and want the same HMC to manage all the server.

If necessary, how can it realize?
A . MES now HMC to 7042-CR8
B . Buy a 7042-CR8 HMC
C . upgrades HMC code into V8R8.2.0
D . The current HMC configuration has been able to meet customer needs.

Answer: B