What is meant by the term 'overdriving your headlights' at night?

1. Riding at a speed where your total stopping distance is longer than the distance illuminated by your headlights.
2. Riding with your high beams turned on when approaching oncoming traffic.
3. Using aftermarket headlights that consume more battery than the alternator can provide.
4. Riding with headlight lenses that are dirty or clouded.