Question: In MBMS (Multimedia Broadcast/Multicast Service), how is the destination IP address defined for a multimedia session, and what is its scope when multiple media sessions are present?
Option 1: Defined using the "connection data" field ("c=") at the media level, with each session potentially having a different multicast IP address.
Option 2: Defined using the "media announcement" field ("m=") at the session level, with all sessions sharing the same destination multicast IP address.
Option 3: Defined using the "connection data" field ("c=") at the session level, with all multiple media sessions sharing the same destination multicast IP address.
Option 4: Not explicitly defined in MBMS protocols; it's up to the network implementation.
Explanation: According to MBMS protocols, the destination IP address is defined using the "connection data" field ("c="), and this definition applies at the session level. Moreover, when there are multiple media sessions, they all share the same destination multicast IP address for efficient network resource utilization and simplified management.