When driving with high beams (luces altas) at night on a two-lane rural road, when must you switch to low beams (luces bajas)?

1. Only when the oncoming driver flashes their headlights repeatedly
2. At a prudent distance of not less than 200 metres before meeting an oncoming vehicle, and also when closing on another vehicle from behind
3. Never, because high beams provide maximum visibility
4. Only after passing the oncoming vehicle