When driving at night, if an oncoming vehicle fails to dip its high-beam headlights and dazzles you, what should you do?

1. Turn on your own high beams to retaliate and blind the other driver
2. Slow down, look slightly toward the left-hand road edge marking, and avoid staring directly into the glare
3. Switch your own headlights to high beam once so they dip theirs
4. Swerve toward the centre of the road to force them to dip their lights