The ip pim autorp listener command is used to do which of these？（）

A.enable a Cisco router to passively listen to Auto-RP packets without the router actively sending or forwarding any of the packets

B.allow Auto-RP packets in groups 224.0.1.39 and 224.0.1.40 to be flooded in dense mode out interfaces configured with the ip pim sparse-mode command

C.enable the use of Auto-RP on a router

D.configure the router as an Auto-RP mapping agent