Aluminium is obtained from purified bauxite using electrolysis. Which row gives the ionic half-equations for the reaction occurring at each electrode?
- Aanode: $\text{Al} \rightarrow \text{Al}^{3+} + 3e^-$; cathode: $2\text{O}^{2-} + 4e^- \rightarrow \text{O}_2$
- Banode: $\text{Al}^{3+} + 3e^- \rightarrow \text{Al}$; cathode: $2\text{O}^{2-} \rightarrow \text{O}_2 + 4e^-$
- Canode: $2\text{O}^{2-} + 4e^- \rightarrow \text{O}_2$; cathode: $\text{Al} \rightarrow \text{Al}^{3+} + 3e^-$
- Danode: $2\text{O}^{2-} \rightarrow \text{O}_2 + 4e^-$; cathode: $\text{Al}^{3+} + 3e^- \rightarrow \text{Al}$