Question: What action should a User Equipment (UE) take when it is unable to comply with part of the configuration included in an RRCResume message?
Option 1: The UE applies the configuration partially and ignores the rest.
Option 2: The UE sends a failure indication to the network and remains in the current state.
Option 3: The UE performs actions upon going to RRC_IDLE with release cause 'RRC Resume failure'.
Option 4: The UE retries applying the configuration after a certain time period.
Explanation: According to the specifications, when a UE is unable to comply with part of the configuration included in an RRCResume message, it should perform actions upon going to RRC_IDLE as specified in the protocol, with release cause 'RRC Resume failure'. This ensures that the UE properly handles the failure and releases any allocated resources.