Question: What is a prerequisite for a User Equipment (UE) to support the `groupWakeUpSignalAlternation-r16` feature in FDD mode while in RRC_IDLE state?
Option 1: The UE must support only `ue-Category-M`.
Option 2: The UE must either support `ce-ModeA-r13` or any `ue-Category-NB`.
Option 3: The UE needs to be in RRC_CONNECTED state.
Option 4: The UE has to support both `ue-Category-M` and `ue-Category-NB`.
Explanation: For a UE to support the `groupWakeUpSignalAlternation-r16` feature, especially in scenarios involving group resource alternation for FDD while in the RRC_IDLE state, it must fulfill specific capability requirements. Among these, supporting either `ce-ModeA-r13` (which pertains to enhanced coverage modes) or any of the `ue-Category-NB` (narrowband categories, often related to IoT or low-bandwidth applications) is mandatory. This ensures the UE can properly handle the alternation of group wake-up signals as specified in relevant 3GPP technical specifications for E-UTRA.