In EPIM-SM, the following description of the PIM Join message is correct?

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Firasat Siddiqui · Accepted Answer

The PIM Join message is sent every 60 seconds to refresh the status of the upstream router mroute for the multicast tree

Firasat Siddiqui · Answer

APIM Join messages are sent every 3 minutes, and status

Firasat Siddiqui · Answer

PIM Join messages for the multicast tree are only sent when the multicast tree is first established

Firasat Siddiqui · Answer

The upstream router sends a PIM Join acknowledgment in response to each PIM Join message received from the downstream router

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