Peroxodisulfate ions, $\text{S}_2\text{O}_8^{2-}$, undergo reaction with iron(II) ions, $\text{Fe}^{2+}$. $\text{S}_2\text{O}_8^{2-} + 2\text{Fe}^{2+} \rightarrow 2\text{SO}_4^{2-} + 2\text{Fe}^{3+}$. In this reaction, sulfur and iron are the only elements that are oxidised or reduced. Which row is correct?
- Airon; oxidising agent
- Biron; reducing agent
- Csulfur; oxidising agent
- Dsulfur; reducing agent