Which statement about multicast Rendezvous Points (RPs) is correct?

In PIM sparse mode, the Rendezvous Point (RP) is crucial for initiating new multicast sessions. When a source begins sending traffic, it registers with the RP. Similarly, when a receiver wants to join a multicast group, it sends a join request to the RP. The RP then facilitates the connection between the source and the receiver. Once the source and receiver have established a direct path (via a shortest path tree or SPT), the RP is no longer actively involved in forwarding traffic for that specific session. It's only needed again if a new source or receiver joins the group. Incorrect options: RPs are not required for PIM dense mode; dense mode floods traffic by default. RPs are not required for both PIM sparse and dense mode; they are specific to sparse mode. The RP is not needed periodically to maintain sessions; once an SPT is built, traffic flows directly.