In an elevator, a student is running an experiment with two Simple Harmonic Motion systems. One is a simple pendulum, and the other is a mass attached vertically to a spring. When the elevator is stationary, the periods of both systems are identical. When the mass of each oscillator reaches the maximum height in their motion, the elevator suddenly starts moving upward with constant acceleration. What can be said about the amplitude of motion or the oscillation frequency in the two systems?
a. The amplitudes of both the pendulum and spring increase.
b. The amplitude the pendulum stays the same, but the amplitude of the spring increases.
c. The frequencies of both the pendulum and spring increase.
d. The frequency of the pendulum increases, but the frequency of the spring stays the same.
e. The frequency of the pendulum stays the same, but the frequency of the spring increases.