Question: In a UMTS Circuit Switched (CS) domain, what triggers the measurement of 'Number of successful SC seizures' in a Media Gateway Function (MGWFunction)?
Option 1: Receipt of H.248 commands 'Add Request' or 'Modify Request' for Speech Coder (SC) service
Option 2: Sending of H.248 commands 'Add Reply' or 'Modify Reply' after successful execution of 'Add Request' or 'Modify Request' for SC service without failure
Option 3: Failure of H.248 commands due to congestion for SC service
Option 4: Completion of a circuit switched call in the UMTS network
Explanation: The measurement for 'Number of successful SC seizures' is triggered by sending H.248 commands 'Add Reply' or 'Modify Reply' after successfully executing an 'Add Request' or 'Modify Request' for Speech Coder (SC) service, indicating a seizure attempt was completed without issues like congestion.