The pendulum from Experiment I has been experimentally determined to have a period of 1' when released from an angle on . The pendulum is then attached to the ceiling of an elevator that travels upward. The pendulum is released from rest at an angle (x att = 0) s. From = 0 s to f - 10 s, the elevator travels with a constant speed. From f = 10 s tot = 20 s, the elevator decreases its speed with a constant acceleration. From = 20 # to t - 30 s. the elevator remains at rest. Which of the following graphs represents the period of the pendulum as a function of time