Question: What action does the RNC take if a DIRECT TRANSFER message from the CN contains the SIPTO L-GW Transport Layer Address IE or the LHN ID IE?
Option 1: The RNC continues with the Direct Transfer procedure, ignoring the included IE.
Option 2: The RNC sends back the included NAS-PDU IE to the UE and terminates the Rerouting Function.
Option 3: The RNC considers the Direct Transfer procedure as failed.
Option 4: The RNC requests additional information from the CN before proceeding.
Explanation: If a DIRECT TRANSFER message contains either the SIPTO L-GW Transport Layer Address IE or the LHN ID IE, the RNC considers the procedure as failed due to incorrect parameter inclusion in signaling messages.