A customer would like to add a second HMC to an environment which consists of multiple
POWER7 and POWER8 systems. Which of the following is a requirement for both HMCs to
be able to manage all the systems?

A.
Both HMCs must be on the same HMC VLAN.
B.
Each HMC must be on a dedicated HMC VLAN.
C.
All the POWER7 systems must be at the same firmware level.
D.
Both HMCs must be at the same code level.
answer should be D
https://www.ibm.com/support/knowledgecenter/POWER6/iphai/iphai.pdf
check page 4: Adding a second HMC to an existing installation
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the answer is D.
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