I think Beatriz is correct. A) The PIM DM device receives a multicast packet and has no directly connected members is the condition that must be met for an RPF check to be performed on the RP address.
I'm pretty sure the answer is B. The PIM router or multilayer switch needs to have a shared-tree state for the RPF check on the RP address to be performed. That makes sense to me.
Yes, that's a good point. The shared-tree state means the router is using the RP as the root of the multicast distribution tree, so the RPF check on the RP address would be necessary.
Yeah, that would be a pretty strange condition. I'm glad the actual answer seems to be B. It makes the most logical sense in the context of multicast routing.
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