Which explanation describes a wireless client IGMP multicast join request using a Cisco Unified Wireless Network v5.2 architecture of AP to WLAN controller?（）

• A、passed by the AP to its connected switch and then forwarded directly to the connected router，which  creates an MGID table entry
• B、passed by the AP to the WLAN controller and then forwarded to the source PIM-enabled router，which  creates an MGID table entry
• C、passed by the AP to the WLAN controller， which creates an MGID table entry before forwarding to the  directly connected PIM-enabled router
• D、passed by the AP to its connected switch and then forwarded to the rendezvous point router，which  creates an MGID table entry