D is correct. "If a PIM router has no source-tree state, it is considered a shared tree state. The router will perform a RPF check on the address of the rendezvous point – the rendezvous address is known when members join the group"
https://www.routeprotocol.com/reverse-path-forwarding-rpf/
D. The PIM router or multilayer switch has a shared-tree state.
In a multicast network, the Reverse Path Forwarding (RPF) check is performed to ensure that multicast traffic flows along the optimal path and to prevent loops. When a PIM router or multilayer switch has a shared-tree state, it means that it is using a shared distribution tree with a Rendezvous Point (RP) at its root. In this case, the RPF check is performed on the RP address to ensure that multicast packets are being received from the correct upstream path toward the RP.
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