Question: What is a prerequisite for a User Equipment (UE) to support subframe resource reservation for UL in CE Mode B for coexistence with NR?
Option 1: The UE must also support coverage enhancement mode B as specified in an earlier release
Option 2: The UE needs to operate exclusively in TDD (Time Division Duplex) mode
Option 3: The UE has to be capable of transmitting on multiple bands simultaneously
Option 4: The UE should have a specific NR (New Radio) frequency band allocated
Explanation: For a UE to support subframe-level UL resource reservation in coverage enhancement mode B, it must also support an earlier specified version of coverage enhancement mode B, ensuring compatibility and proper functioning in enhanced coverage scenarios with NR coexistence.