The citric acid is a stage of catabolism that oxidizes acetate into carbon dioxide and generates energy. There are eight enzymes involved in the citric acid cycle.

Which enzymes produce NADH as a product? Select all that apply

a. alpha-ketoglutarate dehydrogenase

b. succinate dehydrogenase

c. malate dehydrogenase

d. isocitrate dehydrogenase