Metals can be highly purified using electrolysis. Which equation best reflects the overall process of purifying copper?
A. Cu^+2 (aq) cathode - --> Cu^+2 (aq) anode
B. Cu^+2 (aq) anode - --> Cu^+2 (aq) cathode
C. Cu (s) cathode - --> Cu (s) anode
D. Cu (s) anode - --> Cu (s) cathode
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