Although PIM is called a multicast routing protocol, it actually uses the unicast routing table to perform the
reverse path forwarding (RPF) check function instead of building up a completely independent multicast routing
table. Unlike other routing protocols, PIM does not send and receive routing updates between routers
Provided answer is correct
https://en.wikipedia.org/wiki/Protocol_Independent_Multicast#:~:text=PIM%20is%20not%20dependent%20on%20a%20specific%20unicast%20routing%20protocol%3B%20it%20can%20make%20use%20of%20any%20unicast%20routing%20protocol%20in%20use%20on%20the%20network.%20PIM%20does%20not%20build%20its%20own%20routing%20tables.%20PIM%20uses%20the%20unicast%20routing%20table%20for%20reverse%2Dpath%20forwarding.
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