You are a network techn ician, study the exhibit carefully. All multilayer switches are running PIM sparse mode. Host CKB and Host CKF are sending IGMPv2 join messages to their respective multilayer switches. Which description is correct?（）

• A、Switches 1, 2, 3, and 6 will part icipate in the multicast tree once pruning has taken place.
• B、Switches 2 and 6 will participate in the multicast tree once pruning has taken place.
• C、Switches 1, 2, 3, and 6 will participate in the multicast tree.
• D、The multicast server is the rendez vous point of the multicast tree.