During which step of cellular respiration is NADH oxidized to produce ATP and water?

The electron transport chain is the step of cellular respiration that oxidizes NADH molecules to produce ATP and water. The Calvin cycle is not a step within cellular respiration, but rather, is part of photosynthesis to make glucose. The Krebs cycle is the step within cellular respiration that oxidizes pyruvate to CO2, producing ATP, NADH, and FADH2 as a result. Glycolysis is the step within cellular respiration that breaks down glucose into two pyruvates, producing NADH and ATP as a result.