What is the primary function of an Anti-lock Braking System (ABS) in a passenger car during emergency braking?

1. Prevents wheel lockup, allowing the driver to maintain steering control and vehicle stability while braking
2. Shortens braking distance by 90% on ice and snow
3. Applies the handbrake automatically whenever the car exceeds 100 km/h
4. Eliminates tire wear completely during hard stops