Question: Under what condition can an application-initiated switch from Point-to-Point Single Stream (PSS) to Multimedia Broadcast/Multicast Service (MBMS) access occur seamlessly without a service change?
Option 1: When the User Equipment (UE) has insufficient battery life for PSS.
Option 2: When the network instructs the UE to reduce PSS usage due to congestion.
Option 3: If the UE can receive both PSS and MBMS flows simultaneously, with a small time offset between packet receptions and identical media encoding used.
Option 4: Automatically when the UE moves out of PSS coverage range.
Explanation: For an application-initiated switch from PSS to MBMS to occur seamlessly without changing the service, specific technical conditions must be met. These include the ability of the User Equipment (UE) to receive both types of streams at the same time, a minimal delay between receiving packets via either method, and the use of identical media encoding for both streams. This ensures that the switch does not interrupt the service continuity from the user's perspective. Option 3 accurately reflects these necessary conditions.