The SP core supports PIM-SM for multicast traffic, but one of these routers is not able to see one
of its PIM neighbors. What is the most likely cause of this issue?

A.
The router is an RP with high priority.

B.
IGMP snooping is not enabled.

C.
PIM sparse mode is not enabled on a participating multicast interface.

D.
PIM protocols are not enabled in global configuration mode.

E.
Auto-RP is not enabled on this network.