What is the purpose of an anti-lock braking system (ABS)?

• It helps avoid a collision with the vehicle in front.
• It prevents tire skids and the accompanying loss of steering control.
  Explanation:

  "ABS is designed to sense the speed of the wheels on a vehicle during braking. An abnormal drop in wheel speed, which indicates a potential wheel lock, causes the brake force to be reduced to that wheel. This is how ABS prevents tire skids and the accompanying loss of steering control."
• It locks the wheel to stop the vehicle more easily.
• All of the above.