The wobbling surface of a warped brake rotor will cause an uneven or pulsating action as you stop. A is correct. The faulty action of the left brake causes stronger braking on the right side. The result, your car wants to dart in that direction. B is correct.
ABS is an acronym for anti-lock braking system.
Anti-lock brakes are designed to prevent skidding and help drivers maintain steering control during an emergency stopping situation. Determine if your car has an anti-lock braking system by noting whether an ABS light flashes on your dashboard during ignition, checking your owner's manual, or asking your dealer. A is correct. When you see your brake warning light go on, go directly to a technician to find out what's wrong and have it fixed. A and B are correct.