Before Removing the Master Cylinder on an ABS System with a High-Pressure

Before removing the master cylinder on an ABS system with a high-pressure accumulator, the accumulator must be discharged by ______.

A) pumping the brake pedal twenty-five times with the ignition off
B) loosening a bleeder screw on the master cylinder with the ignition on
C) loosening the accumulator one-eighth of a turn with the ignition switch off
D) disconnecting the pump motor and pumping the brake pedal ten times