Which of the following describes the operation of RGMP?

A.
A multicast protocol that works with IGMP snooping to constrain multicast traffic to where it is needed

B.
A protocol that controls multicast traffic where switches send traffic to routers in order to forward multicast traffic more efficiently

C.
A Cisco proprietary multicast protocol that works with CGMP to constrain multicast traffic to where it is needed

D.
Used as an alternative to IGMP snooping or CGMP for controlling multicast traffic within a switch