Question: When a UE receives an OPEN CHANNEL command for a Default (network) Bearer with 3GPP PS data off status set to 'active', what action should the ME take if the service is not exempt?
Option 1: The ME proceeds with establishing the Non-IP data link using the provided Bearer description.
Option 2: The ME sends a TERMINAL RESPONSE (ME currently unable to process command) immediately and aborts the operation.
Option 3: The ME requests additional configuration from the UICC before proceeding.
Option 4: The ME automatically switches to an IP PDP Type for the data link.
Explanation: According to specifications, if the 3GPP PS data off status is 'active' and the UE lacks exemption configuration, the Mobile Equipment (ME) must respond with a TERMINAL RESPONSE indicating it's unable to process the command, aborting the operation. This ensures compliance with network settings and prevents unauthorized transmissions when data services are off.