The Following Electrolytic Cell Is a Representation of the Process

The following electrolytic cell is a representation of the process used to purify copper metal. How does it work?

A) Impure copper is oxidized at the anode, and pure copper is reduced at the cathode. Impurities dissolve into solution.
B) Impure copper is oxidized at the cathode, and pure copper is reduced at the anode. Impurities dissolve into solution.
C) Impure copper is oxidized at the anode, and pure copper dissolves into solution. Impurities remain on the cathode.
D) Impure copper is oxidized at the cathode, and pure copper dissolves into solution. Impurities remain on the anode.
E) Impure copper precipitates from solution onto the cathode, and pure copper remains on the anode.