Question: What is the primary condition for a User Equipment (UE) to include the "emptyUnicastRegion-r14" field in its radio access capabilities?
Option 1: The UE must support LTE-M (Long-Term Evolution for Machines) functionality.
Option 2: The UE must support unicast reception from FeMBMS/Unicast mixed cells.
Option 3: The UE has to be capable of operating in TDD (Time Division Duplexing) mode only.
Option 4: The UE needs to have a specific CA (Carrier Aggregation) configuration.
Explanation: The correct answer is Option 2 because, according to the specifications, the "emptyUnicastRegion-r14" field is included in the UE's radio access capabilities only if the UE supports unicast reception from FeMBMS (Further Enhanced Multimedia Broadcast Multicast Service)/Unicast mixed cells. This indicates that this specific support is a prerequisite for the inclusion of this field, highlighting its relevance to mixed-cell environments where both broadcast/multicast and unicast services are provided.