IGMP (Internet Group Management Protocol) supports several message types: Join, Leave, Query, and Report messages to manage multicast group membership.
Join messages indicate a host wants to join a multicast group.
Leave messages indicate a host is leaving a multicast group.
Query messages are sent by routers to discover group members.
Report messages are sent by hosts to indicate membership.
Therefore, the full set of IGMP message types supported includes Join, Leave, Query, and Report.
Options with only Leave and Report or only Join and Query are incomplete.
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