Question: In IOPS (Isolated Operation for Public Safety) mode, what is the primary purpose of utilizing MBMS (Multimedia Broadcast Multicast Services) transmissions for Mission Critical (MC) services?
Option 1: To establish dedicated uplink channels for MC service UEs (User Equipment)
Option 2: For the downlink delivery of non-MC service related public alerts
Option 3: Exclusively for MCPTT (Mission Critical Push To Talk) voice communications
Option 4: For the downlink delivery of MC service application signalling and media to MC service UEs over MBMS bearers
Explanation: In the context of IOPS, MBMS transmissions are leveraged to efficiently deliver mission-critical data and signaling to multiple User Equipment (UEs) simultaneously. This approach optimizes resource utilization for downlink communications, which is crucial in public safety scenarios where reliable and swift information dissemination is paramount. The correct answer reflects this technical application, highlighting the importance of MBMS in supporting group communications for MC services by delivering both service application signalling and media.