In the HW IP multicast network where many sources are also receivers, what protocol is used to allow the use of the same shared tree for traffic from sources towards RP and from RP towards receivers?

In the HW IP multicast network where many sources are also receivers, what protocol is used to allow the use of the same shared tree for traffic from sources towards RP and from RP towards receivers?
A . PIM Dense Mode (PIM DM)
B . Multicast Open Shortest Path First (MOSPF)
C . Distance Vector Multicast Routing Protocol (DVMRP)
D . Bidirectional PIM
E . PIM Sparse Mode (PIM SM)

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Answer: D