What is the primary function of an Anti-lock Braking System (ABS) and Electronic Braking System (EBS) on a heavy commercial tractor-trailer combination?

1. Prevents wheel lockup during emergency braking, preserves steering controllability, optimizes tractor-trailer brake synchronization, and prevents jackknifing
2. Allows the truck to stop instantly within 2 meters from a speed of 100 km/h
3. Eliminates the physical need to maintain following distances on wet expressways
4. Automatically increases engine horsepower during heavy uphill mountain climbs