About multicast routing, which are correct? (Multiple choices)

About multicast routing, which are correct? (Multiple choices)
A . Multicast routing protocols are used to establish and maintain multicast routes and forward multicast packets correctly and efficiently.
B . Multicast routing forms a one-way loop-free data transmission path from a data source to multiple receivers, that is, a multicast distribution tree.
C . Multicast routing protocols are divided into intra-domain multicast routing and inter-domain multicast routing protocols.
D . The multicast routing protocol includes the IGMP protocol.

Answer: ABC