A network engineer is configuring a router to send multicast traffic for the 239.

 The ip igmp join-group command is used on a router interface to simulate the presence of an IGMP host for a specific multicast group. By issuing the command ip igmp join-group 239.10.10.10, the router is configured to join the multicast group 239.10.10.10 and will receive multicast traffic for this group. This is useful for testing or when the router itself needs to receive the multicast stream.

References: The correct configuration for joining a multicast group is outlined in the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials