Which of the following statements concerning IGMP are correct？（Choose all that apply.）（）

• A、With IGMPvl， queries are sent to a specific group
• B、Hosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibility
• C、An IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are present
• D、With IGMFV2， a leave message is supported
• E、An IGMPv2 host will send an IGMFVl report on an IGMFVl router
• F、An IGMPv2 router can only allow IGMPv2 hosts to execute a join request