Question: What is the purpose of including the MBMS-GGSN-Ipv6-Address AVP in a dual-stack GGSN?
Option 1: To provide the GGSN's IPv4 address for control plane data.
Option 2: To request the BM-SC's user plane unicast address.
Option 3: To indicate the GGSN's support for IPv6.
Option 4: To provide the GGSN's IPv6 address for user plane data.
Explanation: The MBMS-GGSN-Ipv6-Address AVP is used to provide the GGSN's IPv6 address for user plane data, which is necessary when the BM-SC requests the GGSN's user plane unicast address in a dual-stack scenario.