Question: What should the UE do when it encounters IEs with an unknown IEI in a Type 6 IE container information element that are not encoded as "comprehension required"?
Option 1: The UE shall send an error message to the network.
Option 2: The UE shall discard the entire message.
Option 3: The UE shall process the IEs with known IEIs in the same container.
Option 4: The UE shall ignore all IEs with unknown IEI in the Type 6 IE container information element.
Explanation: According to the specification, when a UE encounters IEs with an unknown IEI in a Type 6 IE container information element that are not encoded as "comprehension required", it should ignore those IEs. This ensures that the UE does not process any information elements that it does not understand, which could potentially cause errors or security issues.