Question: In Mission Critical Video (MCVideo) services, when switching from MBMS (Multicast/Broadcast Multimedia Service) bearer to unicast bearer, which of the following reference points are utilized by the MCVideo service?
Option 1: MCVideo-1, MCVideo-3, MCVideo-5
Option 2: MCVideo-2, MCVideo-4, MCVideo-6
Option 3: MCVideo-1, MCVideo-2, MCVideo-8
Option 4: MCVideo-1, MCVideo-4, MCVideo-7, MCVideo-8, MCVideo-9
Explanation: The correct answer is Option 4 because, according to the specified procedure for switching from MBMS bearer to unicast bearer in the context of MCVideo services, the service utilizes specific reference points for this transition. These include MCVideo-1 (typically for client-server interactions), MCVideo-4 (often related to service-specific signaling), MCVideo-7 and MCVideo-8 (which might be involved in bearer management or service flow control), and MCVideo-9 (potentially handling additional service or network adjustments). This combination ensures a comprehensive handover process, maintaining service continuity and quality.