Question: What is a prerequisite for a User Equipment (UE) to support DL channel quality reporting in coverage enhancement mode A or B?
Option 1: The UE must operate exclusively in RRC_IDLE state.
Option 2: The UE must also indicate support for ce-ModeA-r13.
Option 3: The UE needs to have a minimum of four receive antennas.
Option 4: The UE should be capable of transmitting on multiple component carriers simultaneously.
Explanation: For a UE to support DL channel quality reporting in coverage enhancement modes A or B, it is mandatory that the UE also supports ce-ModeA-r13. This ensures effective operation under enhanced coverage conditions while providing detailed channel quality feedback for the serving cell when in RRC_CONNECTED state.