In PIM-DM, which of the following messages needs to be sent by a downstream interface when the downstream interface recovers to the forwarding state from the prune state?

Question

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In PIM-DM (Protocol Independent Multicast - Dense Mode), when a downstream interface recovers to the forwarding state from the prune state, a Graft message is sent to inform upstream routers to resume forwarding multicast traffic.

In PIM-DM, Which of the Following Messages Needs to Be