Question: In an MBMS (Multimedia Broadcast/Multicast Service) scenario, when the BM-SC (Broadcast Multicast Service Centre) receives GCS AS UDP/IP packets over the MB2-U interface, what action does it perform on the user plane IP data before forwarding?
Option 1: The BM-SC adds a new TCP header for guaranteed delivery.
Option 2: The BM-SC removes the UDP/IP header and performs UDP/IP encapsulation.
Option 3: The BM-SC applies ROHC header compression without any prior packet modification.
Option 4: The BM-SC uses the MBMS FEC scheme for error protection by default.
Explanation: This is correct because, according to the transport method described for MBMS, upon receiving GCS AS UDP/IP packets, the BM-SC's role involves removing the existing UDP/IP header and then encapsulating the user plane IP data with a new UDP/IP header for transmission over the broadcast link. This process ensures compatibility and efficient delivery across different network segments.