What is true about the functionality of IGMPv3?

The functionality of IGMPv3 (Internet Group Management Protocol version 3) encompasses several key features that enhance IPv4 multicast group management. Among these is its support for the Source-Specific Multicast (SSM) model, which allows a receiver to specify both the group and the specific source from which it wants to receive multicast traffic. This capability significantly enhances multicast efficiency and enables improved traffic management.

Additionally, IGMPv3 does indeed support querier election, which is critical for a multicast network. In typical multicast environments, a querier is a router responsible for soliciting group membership information from hosts. This feature ensures that there is always one active querier in the network, which is vital for maintaining efficient group management and minimizing unnecessary traffic.

The proactive group leave functionality, which allows hosts to inform the network that they are leaving a multicast group before actually leaving, is also an enhancement present in IGMPv3. This option helps to minimize the wait time for group membership updates and reduces transient traffic from hosts that occasionally switch states.

Given these capabilities, selecting an answer that reflects all of these functions accurately captures the comprehensive and advanced features of IGMPv3, making it evident that the correct response encompasses multiple aspects, including querier election support