In the electrolysis of aqueous copper(II) sulfate with copper electrodes, what ionic half-equations represent the reactions occurring at each electrode?
- Aanode: $\text{Cu} \rightarrow \text{Cu}^{2+} + 2e^{-}$; cathode: $\text{Cu}^{2+} + 2e^{-} \rightarrow \text{Cu}$
- Banode: $\text{Cu}^{2+} + 2e^{-} \rightarrow \text{Cu}$; cathode: $\text{Cu} \rightarrow \text{Cu}^{2+} + 2e^{-}$
- Canode: $4\text{OH}^{-} \rightarrow 2\text{H}_2\text{O} + \text{O}_2 + 4e^{-}$; cathode: $\text{Cu}^{2+} + 2e^{-} \rightarrow \text{Cu}$
- Danode: $4\text{OH}^{-} \rightarrow 2\text{H}_2\text{O} + \text{O}_2 + 4e^{-}$; cathode: $2\text{H}^{+} + 2e^{-} \rightarrow \text{H}_2$