<prompt> Which component transfers four protonsa NADH-Q oxidoreductaseb Cytochrome-C oxidasec Cytochrome C - Q oxidoreductased Isocitrate dehydrogenasee Succinate Q reductaseacbcadb  <response>: NADH-Q oxidoreductase c i.e., Cytochrome C - Q oxidoredictaseComplex I NADH-CoQ reductase and complex in CoQ - cytochrome c reductase pump 4 protons each and complex IV cytochrome c oxidase pumps 2 protons. 