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Question 10:

Using Internet Group Management Protocol, (IGMP) version 2, how can a node exit or stop participating in a multicast group?

It must time out because there is no explicit exit group statement.
The node must issue a specific leave statement.
The node has no control over the its group participation; group management is accomplished by the router.
Both the node and the router must be administratively configured to NOT participate in a specific multicast group.