Question: What action does the UE take when it receives a 5GMM or 5GSM message containing a Type 6 IE container information element with at least one syntactically incorrect conditional IE?
Option 1: The UE ignores the message and returns a status message (5GMM STATUS or 5GSM STATUS) with cause #100 "conditional IE error".
Option 2: The UE tries to treat the message and takes implementation-dependent further actions.
Option 3: The UE sends an error message to the network indicating the specific conditional IE error.
Option 4: The UE discards the message without taking any further action.
Explanation: According to the 3GPP specification, when the UE receives a 5GMM or 5GSM message containing a Type 6 IE container information element with at least one syntactically incorrect conditional IE, it shall ignore the message and return a status message (5GMM STATUS or 5GSM STATUS) with cause #100 "conditional IE error". This ensures that the UE does not process the erroneous message and informs the network about the error.