Which three statements are true about the Internet Group Management Protocol (IGMP)? （）
- A There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode
- B IGMP is used to register individual hosts with a multicast group
- C IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from
- D IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1
- E IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP
- F IGMP snooping ru ns on Layer 3 router