When coordinating an arriving aircraft handoff between Approach Control (APP) and Aerodrome Control (TWR), when does control transfer typically take place?

1. When the aircraft is in the vicinity of the aerodrome and it is considered that landing can be completed visually, or at a designated point/level
2. At the exact moment the aircraft crosses the outer marker on the ILS
3. Only after the aircraft has completed its landing roll and vacated the active runway
4. When the aircraft first establishes contact with the FIR boundary