Which option correctly describes glucose catabolism?

1. glucose is broken down in glycolysis, yielding two atp molecules; after the krebs cycle, 34 molecules of atp are formed in ets reactions.

2. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, two molecules of atp are formed in ets reactions.

3. glucose is broken down in glycolysis, yielding two atp; after the krebs cycle, nadh and fadh2 are formed, yielding nad+ and fad in ets reactions.

4. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, nadh and fadh2 are formed, yielding 34 adp in ets reactions.