The advantage of having a tandem master cylinder arrangement in automobiles is that it
a) Enhances safety by serving two independent lines in a divided line brake circuit
b) Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
c) Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
d) Boosts the brake fluid pressure to reduce the force required to depress the brake pedal