Which two statement about the multicast addresses query message are true?(Choose two)
A. They are solicited when a node initialized the multicast process.
B. They are used to discover the multicast group to which listeners on a link are subscribed
C. They are used to discover whether a specified multicast address has listeners
D. They are send unsolicited when a node initializes the multicast process
E. They are usually sent only by a single router on a link
F. They are sent when a node discover a multicast group