Question: What is a prerequisite for a User Equipment (UE) to support 10 DL HARQ processes in Frequency Division Duplexing (FDD) when operating in Coverage Enhancement Mode A?
Option 1: Support for Massive MIMO (Multiple Input Multiple Output)
Option 2: Indication of support for ce-ModeA-r13
Option 3: Capability for 256-QAM (Quadrature Amplitude Modulation) in DL
Option 4: Activation of Carrier Aggregation
Explanation: According to E-UTRA specifications, a UE must indicate support for ce-ModeA-r13 to support 10 DL HARQ processes in FDD when operating in Coverage Enhancement Mode A, ensuring the UE can handle the enhanced mode's requirements.