When oligomycin is added to an actively respiring muscle cell, ATP synthase is inhibited. Which of the following predicts the effect of oligomycin on the rate of oxygen usage and the rate of electron transport through the ETC?

a) The rate of oxygen usage remains the same, but the rate of electron transport through the ETC decreases.
b) The rate of electron transport through the ETC remains the same, but the rate of oxygen usage decreases.
c) The rates of both oxygen usage and electron transport through the ETC decrease.
d) The rates of both oxygen usage and electron transport through the ETC remain the same.