When the sample of copper with the zinc impurity is to be purified by electrolysis, the appropriate electrodes are
A. `{:("Cathode","Anode"),("Pure copper","Pure zinc"):}`
B. `{:("Cathode","Anode"),("Pure Zinc","Pure Copper"):}`
C. `{:("Cathode","Anode"),("Pure Copper","ImPure Copper"):}`
D. `{:("Cathode","Anode"),("Pure Zinc","ImPure Zinc"):}`