Which two operations should be performed to accomplish this task?

You have an AFF A220 cluster connected to a dual fabric topology. You must ensure that SAN hosts do not lose access to LUNs during unplanned failures.

Which two operations should be performed to accomplish this task? (Choose two.)
A . Manually set all LUNs offline.
B.Manually set all FC LIFs on a single node to "down".
C.Turn the power off on one disk shelf.
D.Initiate a reboot of one Fibre Channel switch.

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Answer: BD