Question: What is the primary purpose of the MCVideo-4 reference point in a Mission Critical Video (MCVideo) setup, as defined in telecom standards?
Option 1: To facilitate multicast transmission for MCVideo streaming
Option 2: For MCVideo transmission control signalling over unicast connections
Option 3: To establish a direct link between User Equipment (UE) for peer-to-peer video sharing
Option 4: To manage Quality of Service (QoS) for non-mission-critical video services
Explanation: The MCVideo-4 reference point's role is in transmission control signalling specifically over unicast connections, crucial for managing and ensuring reliable, controlled video transmissions in mission-critical scenarios. The other options are incorrect because they either misrepresent the connection type, the service type, or the primary function.