Regarding the description of PIM-DM, which is wrong?

Regarding the description of PIM-DM, which is wrong?
A . PIM-DM is called protocol independent multicast-dense mode and belongs to dense mode multicast routing protocol.
B . PIM-DM assumes that at least one receiving site interested in the multicast source exists in each subnet in the network.
C . PIM-DM uses the GRAFT grafting mechanism to actively resume the forwarding of multicast packets.
D . PIM-DM does not have periodic diffusion and pruning

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Answer: D