Question: What is a prerequisite for a User Equipment (UE) to support flexible starting PRB for PDSCH in RRC_CONNECTED when operating in Coverage Enhancement Mode B?
Option 1: Support for ce-PDSCH-FlexibleStartPRB-CE-ModeB implies prior support for ce-ModeB
Option 2: Activation of Carrier Aggregation (CA) on the UE
Option 3: Configuration of at least two Serving Cells for the UE
Option 4: UE's capability to perform Blind Decoding for PDSCH
Explanation: For a UE to support flexible starting PRB for PDSCH in Coverage Enhancement Mode B, it must also support Coverage Enhancement Mode B itself. This ensures the UE can properly handle enhanced coverage features while utilizing flexible start PRB configurations.