Which of the following statements describes NAD+?
a. NAD+ is oxidized by the action of hydrogenates.
b. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
c. NAD+ can donate electrons for use in oxidative phosphorylation.
d. In the absence of NAD+, glycolysis can still function.
e. NAD+ has more chemical energy than NADH.