The correct structure of tribromooctaoxide is:

Which of the following reactions are disproportionation reaction?

$\left(a\right)$ $2\mathrm{C}{\mathrm{u}}^{+}\to \mathrm{C}{\mathrm{u}}^{2+}+\mathrm{C}{\mathrm{u}}^0$

$\left(b\right)$ $3\mathrm{M}\mathrm{n}{\mathrm{O}}_4^{2-}+4{\mathrm{H}}^{+}\to 2\mathrm{M}\mathrm{n}{\mathrm{O}}_4^{-}+\mathrm{M}\mathrm{n}{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}$

$\left(c\right)$ $2\mathrm{K}\mathrm{M}\mathrm{n}{\mathrm{O}}_4\stackrel{∆}{\to }{\mathrm{K}}_2\mathrm{M}\mathrm{n}{\mathrm{O}}_4+\mathrm{M}\mathrm{n}{\mathrm{O}}_2+{\mathrm{O}}_2$

$\left(d\right)$ $2\mathrm{M}\mathrm{n}{\mathrm{O}}_4^{-}+3\mathrm{M}{\mathrm{n}}^{2+}+2{\mathrm{H}}_2\mathrm{O}\to 5\mathrm{M}\mathrm{n}{\mathrm{O}}_2+4{\mathrm{H}}^{\oplus }$

Select the correct option from the following: