Which of the following are true of electron transport and oxidative phosphorylation. There is more than one correct answer, please select all appropriate options to receive credit. a. Electron transport requires an external electron acceptor b. Oxidative phosphorylation results in the production of CO_2 c. Electron transport generates ATP by substrate level phosphorylation d. Electron carriers have increasingly more positive reduction potential (E_0) as you move along the electron transport chain e. Electron carriers in the electron transport chain alternate between electron-only and electron-plus-proton carriers f. Electron transport results in the generation of a proton motive force g. Cytochromes harness the proton motive force to generate ATP h. ATP synthase is used to convert proton motive force into ATP