Which of the following is an example of a disproportionation reaction?

A disproportionation reaction is one in which the same element undergoes both oxidation and reduction at the same time. A single chemical produces two products in this kind of reaction, one of which is oxidized and the other is reduced.

$\begin{array}{l}{\mathrm{KClO}}_3\to {\mathrm{KClO}}_4+\mathrm{KCl}\\ {\mathrm{Cl}}_2+{\mathrm{OH}}^{-}\to {\mathrm{ClO}}^{-}+{\mathrm{Cl}}^{-}+{\mathrm{H}}_2\mathrm{O}\end{array}$

Hence, the correct option is (c, d)