By gradually reducing the size of the ellipse described by the north end of the spin axis around the North Pole, a gyroscope can be made into a North Settling or North Indicating Gyroscope. This is done by:
a) Applying damping in tilt and drift (azimuth)
b) Increasing the weight of the spinner/rotor
c) Reducing all forces due to the movement of the ship at sea
d) None of the above