Question: For a UE operating in Transmission Modes (TM) 1 to 9, which CRS Interference Mitigation (CRS-IM) configuration for PDSCH with 1 receiver antenna port is NOT mentioned as a supported feature for DL Category 1bis or DL Category M2 UEs?
Option 1: CRS-IM with 1 CRS antenna port
Option 2: CRS-IM with 8 CRS antenna ports
Option 3: CRS-IM with 2 CRS antenna ports
Option 4: CRS-IM with 4 CRS antenna ports
Explanation: The correct answer is Option 2 because the specified CRS-IM features for PDSCH with 1 receiver antenna port include configurations with 2 and 4 CRS antenna ports, but not a configuration with 8 CRS antenna ports, for these UEs in Transmission Modes 1 through 9.