Question: For a User Equipment (UE) supporting extended idle mode DRX for TDD, as indicated by the `wakeUpSignalMinGap-eDRX-TDD-r15` field, what additional support is mandated?
Option 1: Support for both `wakeUpSignal-FDD-r15` and `groupWakeUpSignalFDD-r16`
Option 2: Support for either `wakeUpSignal-TDD-r15` or `groupWakeUpSignalTDD-r16`
Option 3: Exclusive support for `groupWakeUpSignalTDD-r16`, without `wakeUpSignal-TDD-r15`
Option 4: No additional wake-up signal support is mandated
Explanation: A UE indicating support for `wakeUpSignalMinGap-eDRX-TDD-r15` must also support either `wakeUpSignal-TDD-r15` or `groupWakeUpSignalTDD-r16`, ensuring compatibility with both individual and group wake-up signals in TDD mode, enhancing power-saving capabilities while maintaining connectivity.