Question: In Mission Critical Video (MCVideo) services utilizing pre-established MBMS bearers, what is sent on the same MBMS bearer by default, with an option for a separate bearer due to differing requirements?
Option 1: Only media packets for all group calls
Option 2: Both media packets and transmission control messages to receiving MCVideo clients
Option 3: Only transmission control messages for chat group calls
Option 4: Neither media packets nor transmission control messages (uses a different mechanism)
Explanation: According to the specifications for MCVideo services, when utilizing pre-established MBMS bearers, both the media packets and the transmission control messages are sent on the same MBMS bearer by default. However, there is an option to use a separate MBMS bearer for the transmission control messages if their bearer characteristic requirements differ from those of the media packets.