What must a driver verify BEFORE commencing an overtaking maneuver on a two-lane two-way road?

1. Only that the vehicle ahead is traveling slower than the speed limit.
2. That the oncoming lane is clear for a sufficient distance, no following driver has started overtaking, the vehicle ahead has not signaled to turn/overtake, and they can return to the right lane without obstructing the overtaken vehicle.
3. Only that their horn works properly.
4. That the driver behind has turned on hazard lights.