Question: In an Isolated Operation for Public Safety (IOPS) mode, what are the primary functional entities of a User Equipment (UE) supporting Mission Critical (MC) services over the IOPS MC system?
Option 1: Only a single entity for both signalling control and application plane management
Option 2: Separate entities for MC service client(s), IOPS connectivity client, and signalling user agent
Option 3: Entities solely for bearer services and general applications without specific IOPS clients
Option 4: A combined entity for all telecommunication services, excluding public safety-specific functionalities
Explanation: In the context of IOPS mode for Public Safety, a UE supporting MC services requires specialized functional entities. These include: MC service client(s) for managing mission-critical communications, IOPS connectivity client for seamless connectivity, and Signalling user agent for signalling control. Option 2 correctly identifies these distinct entities, highlighting the nuanced architecture necessary for IOPS MC service support in UEs.