Under standard ATS coordination procedures, when does the 'Transfer of Control' occur between an Approach Control (APP) unit and an Aerodrome Control Tower (TWR)?

1. At an agreed point, level, or time specified in the Letter of Agreement (e.g., when the aircraft is on final approach and has passed the FAF/outer marker or is in sight of the tower).
2. As soon as the aircraft takes off from the departure airport 300 miles away.
3. Only after the aircraft has touched down and cleared the runway.
4. Transfer of control occurs only during night hours.