Question: For an MBMS User Service utilizing Unicast Bearer Services for data transfer, which protocol/service is specifically mandated for MBMS streaming sessions or combined MBMS streaming and download sessions?
Option 1: OMA-PUSH
Option 2: Packet Switched Streaming Service (PSS) - Transparent end-to-end Packet-switched Streaming Service
Option 3: HTTPS - Hypertext Transfer Protocol Secure
Option 4: RTP - Real-time Transport Protocol
Explanation: According to the specified telecom standards for MBMS (Multimedia Broadcast/Multicast Service) over UMTS (Universal Mobile Telecommunications System), when dealing with streaming or combined streaming and download sessions, the Packet Switched Streaming Service (PSS) is the mandated protocol. This ensures efficient and reliable end-to-end streaming of multimedia content to User Equipment (UE). PSS is tailored for such applications, making it the correct choice over OMA-PUSH (primarily used for download sessions), HTTPS (a general web protocol), or RTP (focused on real-time transport, not specifically optimized for MBMS streaming via Unicast Bearer Services).