Question: What action does the UE take upon receiving a UPDS message with a "missing conditional IE" error or an "unexpected conditional IE" error?
Option 1: The UE sends an error message to the network.
Option 2: The UE ignores the message.
Option 3: The UE tries to correct the error and re-sends the message.
Option 4: The UE terminates the connection.
Explanation: According to the protocol, when the UE diagnoses a "missing conditional IE" error or an "unexpected conditional IE" error in a UPDS message, it shall ignore the message. This ensures that the UE does not process incorrect or incomplete information, maintaining the integrity of the communication.