Question: In a Mobile Originated Short Message transfer, if errors occur after invoking the 'sendInfoForMO-SMS' operation, what action does the MSC take to notify the User Equipment (UE)?
Option 1: The MSC retries the 'sendInfoForMO-SMS' operation up to three times before abandoning the request.
Option 2: The MSC sends a success acknowledgement to the UE and logs the error internally for later analysis.
Option 3: The MSC returns appropriate error information to the MS in a failure report, specifically via an RP-ERROR message.
Option 4: The MSC forwards the error to the SGSN (Serving GPRS Support Node) for resolution before responding to the UE.
Explanation: In Mobile Originated Short Message Service (SMS) transfers, when errors occur after invoking 'sendInfoForMO-SMS', the MSC communicates this failure back to the UE via a failure report, specifically through an RP-ERROR message containing coded error cause information, ensuring transparency and feedback.