Question: Which protocol/service is utilized for initiating a Unicast Bearer Service based MBMS User Service with a Streaming traffic class for MBMS Streaming delivery or combined MBMS Streaming and Download delivery?
Option 1: OMA-PUSH, specifically designed for file downloads
Option 2: BM-SC's proprietary streaming protocol for efficient content delivery
Option 3: Packet Switched Streaming Service (PSS) as defined in standards for interactive/streaming traffic classes
Option 4: RTP (Real-time Transport Protocol) directly over UMTS/EPS Bearer Service
Explanation: For MBMS Streaming or combined Streaming and Download delivery methods, the use of Packet Switched Streaming Service (PSS) is mandated due to its suitability for handling interactive and streaming traffic classes efficiently over UMTS/EPS Bearer Services. PSS ensures end-to-end streaming capabilities, making it the correct choice for such delivery scenarios in MBMS services.