In the given reaction,

${\mathrm{FeSO}}_4+{\mathrm{KClO}}_3⟶\mathrm{KCl}+{\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$

$\text{ I. }{\mathrm{FeSO}}_4\text{ acts as reducing agent. }$

$\text{ II. }{\mathrm{KClO}}_3\text{ is reduced. }$

$\text{ III. The change in oxidation number of Fe is }2\text{. }$

IV. The change in oxidation number of Cl is -6.

Select the correct statements and choose the correct option.