Which of the following oxidation reactions are carried out by both ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ and ${\rm{KMn}}{{\rm{O}}_4}$ in acidic medium?
A. $\Gamma \to {{\rm{I}}_2}$
B. ${{\rm{S}}^{2 - }} \to {\rm{S}}$
C. ${\rm{F}}{{\rm{e}}^{2 + }} \to {\rm{F}}{{\rm{e}}^{3 + }}$
D. $\Gamma \to {\rm{IO}}_3^ - $
E. ${{\rm{S}}_2}{{\rm{O}}_3}^{2 - } \to {\rm{S}}{{\rm{O}}_4}^{2-}$
Choose the correct answer from the options given below: