Question: What happens to the application layer measurement configurations when a UE enters RRC_IDLE state?
Option 1: All application layer measurement configurations are released.
Option 2: Only the configurations explicitly indicated by the gNB as applicable in RRC_IDLE and RRC_INACTIVE states are stored.
Option 3: The UE releases all application layer measurement configurations except the ones explicitly indicated by the gNB as applicable in RRC_IDLE and RRC_INACTIVE states.
Option 4: All application layer measurement configurations are deleted.
Explanation: According to the text, when a UE enters RRC_IDLE state, it releases all application layer measurement configurations except the ones explicitly indicated by the gNB as applicable in RRC_IDLE and RRC_INACTIVE states. This ensures that QoE measurements can continue even when the UE is not actively connected to the network.