11. Which of the following statements about voltaic (galvanic) and electrolytic cells is correct? (A) The anode will definitely gain weight in a voltaic cell. (B) Oxidation occurs at the cathode of both cells. (C) The free energy change, G, is negative for the voltaic cell. (D) The electrons in the external wire flow from cathode to anode in an electrolytic cell. (E) none of these.