An aqueous copper(II) sulfate solution was electrolysed with copper electrodes. Which equation correctly shows the reaction occurring at the anode?
- A$\text{Cu} \rightarrow \text{Cu}^{2+} + 2e^{-}$
- B$\text{Cu} + 2e^{-} \rightarrow \text{Cu}^{2+}$
- C$\text{Cu}^{2+} \rightarrow \text{Cu} + 2e^{-}$
- D$\text{Cu}^{2+} + 2e^{-} \rightarrow \text{Cu}$