Question: In a Circuit Switched (CS) domain, what happens to the recorded Mobile Station Classmark if it changes during an ongoing connection, in terms of timing information?
Option 1: The initial classmark is overwritten with the new one, without timestamp.
Option 2: The change is recorded in a separate field, including the time of the change.
Option 3: A new charging record is created with the updated classmark and current timestamp.
Option 4: The classmark change is not recorded if partial records are generated for that connection.
Explanation: This is correct because any alteration in the classmark during a connection may be recorded in a separate field, which includes the time at which the change took place, providing a clear audit trail of changes without overwriting initial setup information.