When driving at night on an unlit rural road using high-beam headlights (feux de route), when must you switch to low-beam headlights (feux de croisement)?

1. When approaching an oncoming vehicle or following closely behind another vehicle
2. Only when oncoming drivers flash their headlights repeatedly
3. Only when entering a town with illuminated streetlamps
4. At all times between midnight and 5:00 AM