Aqueous iron(II) sulfate is able to participate in redox reactions. $6\text{FeSO}_4 + 7\text{H}_2\text{SO}_4 + \text{Na}_2\text{Cr}_2\text{O}_7 \\rightarrow 3\text{Fe}_2(\text{SO}_4)_3 + \text{Cr}_2(\text{SO}_4)_3 + \text{Na}_2\text{SO}_4 + 7\text{H}_2\text{O}$ Which redox changes take place in this reaction?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only