Question: For a User Equipment (UE) that supports Multimedia Broadcast Multicast Service (MBMS), what is the nature of indicating MBMS reception using Receive Only Mode in an MBMSInterestIndication message, as per E-UTRA specifications?
Option 1: Mandatory for all UEs supporting MBMS to ensure efficient resource allocation.
Option 2: Conditional, based on the UE's capability to handle simultaneous unicast and broadcast services.
Option 3: Optional, dependent on the UE's implementation choice as specified in Radio Resource Control (RRC) protocols.
Option 4: Not applicable for UEs primarily designed for unicast services, even if they support MBMS.
Explanation: The correct answer is Option 3 because indicating MBMS reception using Receive Only Mode in an MBMSInterestIndication message is not strictly required for UEs that support MBMS. This flexibility allows for varying implementation choices among different UE models or manufacturers, as outlined in RRC protocols, balancing standardized functionality and manufacturer innovation.