Which of the following statements is incorrect?

1. A. In ETC (Electron Transport Chain), one molecule of NADH + H+ gives rise to 2 ATP molecules, and one FADH2 gives rise to 3 ATP molecules
2. B. ATP is synthesized through complex V
3. C. Oxidation-reduction reactions produce proton gradient in respiration
4. D. During aerobic respiration, role of oxygen is limited to the terminal stage

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