Which statement best defines ATP in the context of cellular energy for exercise?

An enzyme complex embedded in the inner mitochondrial membrane that catalyzes oxidative phosphorylation and synthesizes ATP by harnessing an electrochemical gradient across the membrane.

A structural protein in muscle fibers responsible for force transmission and stabilization of sarcomeric alignment during contraction.

A cellular carbohydrate polymer stored in muscle and liver that can be rapidly broken into glucose during exercise to supply ATP production in mitochondria and cytosol.

Adenosine triphosphate, the cell's primary energy carrier that releases usable energy when a terminal phosphate bond is broken.