Question: Upon receiving an "alertServiceCentre" from the HLR, what are the sequential operations performed by the SMS-IWMSC if the SC address is valid?
Option 1: Inspect the SC address → Generate an RP-Alert-SC → Transfer the RP-Alert-SC to the SC
Option 2: Transfer the RP-Alert-SC to the SC → Inspect the SC address → Generate an RP-Alert-SC
Option 3: Generate an RP-Alert-SC → Inspect the SC address → Discard if invalid, else Transfer to SC
Option 4: Discard alert if from unknown HLR → Inspect SC address → Generate and Transfer RP-Alert-SC
Explanation: According to standard SMS-IWMSC functionality related to alerting, upon receiving an alert from the HLR, the correct sequence of operations when the SC address is valid involves first verifying the address, then creating a response to the alert, and finally sending this response back to the SC. This sequence ensures that responses are properly generated and delivered only for valid service centre addresses.