Question: Which protocol is used for the M1 reference point, utilized for MBMS data delivery between the MBMS GW and E-UTRAN/UTRAN?
Option 1: GTPv2-C (GPRS Tunnelling Protocol version 2 for Control plane)
Option 2: GTPv1-U (GPRS Tunnelling Protocol version 1 for User plane)
Option 3: IP Multicast with TCP (Internet Protocol Multicast with Transmission Control Protocol)
Option 4: SCTP (Stream Control Transmission Protocol)
Explanation: The M1 reference point is specifically defined for MBMS data delivery between the MBMS Gateway and E-UTRAN/UTRAN. This interface uses GTPv1-U, tailored for user plane traffic, making it suitable for data delivery scenarios like MBMS, efficiently handling user data forwarding.