In the electron transfer chain reaction, what is the total ATP yield from two NADH2 and two FADH2 molecules together?

1. Each NADH2 molecule yields 3 ATP, so two NADH2 give 6 ATP. 2. Each FADH2 molecule yields 2 ATP, so two FADH2 give 4 ATP. 3. Adding them gives 6 plus 4, which equals 10 ATP. 4. The eight option wrongly treats both as 2 ATP each, so it is ruled out. 5. The twelve option wrongly treats both as 3 ATP each, so it is ruled out. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 2 "Life Processes in Living Organisms Part 1", p.23_