Question: When an IWF receives a DIAMETER_INVALID_AVP_VALUE result for an MO-ForwardSM operation, which MAP error should it map to in the MO-ForwardSM Error message?
Option 1: systemFailure
Option 2: unexpectedDataValue
Option 3: facilityNotSupported
Option 4: sm-DeliveryFailure
Explanation: According to the specified mapping rules for error handling between Diameter and MAP interfaces, a DIAMETER_INVALID_AVP_VALUE result should be mapped to an 'unexpectedDataValue' error in the MO-ForwardSM Error message. This ensures compatibility and accurate error reporting between the two protocol environments.