How should a driver cross a flooded road section or large puddle where water depth is unknown?

1. Stop to assess water depth, drive in low gear (first gear) at a slow, steady speed, and gently test brakes afterward to dry them
2. Accelerate at maximum speed to blast through the water using inertia
3. Shift into neutral and coast across the flooded section
4. Drive on the left shoulder with headlights turned off