Ultimately, respiration and fermentation are simply different ways to conclude sugar catabolism. Following the energy-yielding reactions, respiring cells pass electrons to oxygen (or other external inorganic oxidant), while fermenting cells dump electrons back onto a partially oxidized organic molecule (such as pyruvate), which then exits the cell as a waste product. Either way, the goal is to do which of the following?A. fully oxidize NADH into CO2 and H2OB. recycle NADH back to NAD+C. generate as much NADH as possible (then synthesize more NAD+ if necessary)D. break down NADH into biosynthetic precursorsE. stimulate de novo production of NAD+