Question: What is a prerequisite for a User Equipment (UE) to indicate support for tm6-CE-ModeA-r13 in its radio access capabilities?
Option 1: The UE must support LTE Advanced Pro features.
Option 2: The UE must be operating in TDD (Time Division Duplexing) mode only.
Option 3: The UE must also indicate support for ce-ModeA-r13.
Option 4: The UE needs to have a minimum of four antenna ports.
Explanation: For a User Equipment (UE) to declare support for tm6-CE-ModeA-r13, it is mandatory that the UE also declares support for ce-ModeA-r13, ensuring alignment with defined standards for E-UTRA's physical layer procedures and radio resource control protocol specification.