Which statement best describes the System Control Unit (SCU) in a two-node Power E870 / E880?

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Which statement best describes the System Control Unit (SCU) in a two-node Power E870 / E880?
A . The two nodes share an SCU unit through power and Infiniband cables.
B . The two nodes share an SCU through clock and FSP cables.
C . An SCU is optional when the operator control panel is included on each system node.
D . Each node has its own SCU for redundancy.

Answer: B