4 questions on "Operation of Protocol Independent Multicast Sparse Mode"

What are the two reactions from the RP to register message?
-Allow a router to inform RP that it has a local source for a multicast group
-Allow a router to forward multicasts to the RP encapsulated in unicast packets, until registration is completed
What is the abbreviation for RPT and what does it mean?
root path tree rooted at the RP
What is the default pim prune timer?
3 minutes
What is the command to change the spt-threshold?
(config)#ip pim spt-threshold rate

When this command is not used, the PIM leaf router joins the shortest path tree immediately after the first packet arrives from a new source
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