A network uses PIM-DM to route multicast traffic. The network administrator has noticed bursts of congestion
related to periodic floods of multicast traffic. How can the administrator eliminate these periodic bursts?

A.
Leave PIM-DM enabled on the interfaces that face receivers, but enable PIM-SM throughout the core.

B.
Decrease the PIM hello timer on VLAN interfaces on which PIM-DM is enabled.

C.
Decrease the IGMP robustness variable on VLAN interfaces that connect to receivers.

D.
Enable the state refresh feature on the VLAN interfaces on which PIM-DM is enabled.