Question: What action does the UE take when it receives a DL user data packet marked with RQI for a PDU session where reflective QoS has already been revoked?
Option 1: The UE forwards the packet to the upper layers.
Option 2: The UE ignores the RQI and handles the received DL user data packet normally.
Option 3: The UE sends an error message to the network indicating that reflective QoS is not allowed.
Option 4: The UE drops the packet.
Explanation: According to the text, when the UE receives a DL user data packet marked with RQI for a PDU session where reflective QoS has already been revoked, it shall ignore the RQI and handle the received DL user data packet normally. This is because the UE has already indicated that it does not want to use reflective QoS for this PDU session.