Question: What is a prerequisite for a User Equipment (UE) to support DL resource reservation with slot-level granularity on non-anchor carriers?
Option 1: The UE must support at least one of the FDD or TDD duplex modes.
Option 2: The UE must be capable of operating in standalone mode (SA) for 5G NR.
Option 3: The UE must also indicate support for a related resource reservation feature and support any narrowband-related UE category.
Option 4: The UE needs to have a minimum of two receiver branches for diversity.
Explanation: This is correct because a UE supporting DL resource reservation with slot-level granularity must also support a related subframe-level feature, and this is contingent upon the UE supporting any narrowband-related UE category, highlighting the interdependence of these capabilities for efficient resource management.