This is a tricky one, but I think the answer is D and E. Node failure is an obvious use case, and loss of the full-mesh cluster interconnect would also require the persistent port feature to kick in.
Hmm, I'm not sure about B. SAN switch upgrades don't really seem like an event that would trigger the persistent port feature. D is definitely one, and I'm guessing E might be the other one.
I'd say C and D are the correct answers. Firmware upgrades and node maintenance/failure are the typical scenarios where you'd want transparent failover to keep your data accessible.
A and D seem like the obvious choices here. The persistent port feature is designed to handle failover during node maintenance or failure, and loss of persistent cache would definitely trigger it as well.
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