Question: What is the purpose of including the SGmb application identifier value in the Auth-Application-Id AVP by the BM-SC and the MBMS GW?
Option 1: To indicate support for multiple Diameter applications
Option 2: To enable the detection of an SGmb path failure or the restart of the peer MBMS node
Option 3: To transfer M1 interface information of local MBMS information
Option 4: To advertise the support of the SGmb application and to identify the vendor as 3GPP
Explanation: The correct answer is Option 4 because including the SGmb application identifier value in the Auth-Application-Id AVP allows the BM-SC and the MBMS GW to advertise their support for the SGmb application and to identify the vendor as 3GPP, which is essential for proper communication and interoperability between the nodes. This is specified in IETF RFC 6733 and is a critical aspect of the Diameter protocol used on the SGmb interface.