In an electrolytic cell with copper and tin electrodes, what is the overall chemical reaction?

Tin(II) ions are reduced to tin solid, and copper solid is oxidized to copper(II) ions.

Copper(II) ions are reduced to copper solid, and tin solid is oxidized to tin(II) ions.

Copper solid is reduced to copper(II) ions, and tin(II) ions are oxidized to tin solid.

Tin solid is reduced to tin(II) ions, and copper(II) ions are oxidized to copper solid.