The pair of the compounds in which both the metals are in the highest possible oxidation state is

• A

  ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-},{\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$

• B

  ${\mathrm{CrO}}_2{\mathrm{Cl}}_2,{\mathrm{MnO}}_4^{-}$

• C

  ${\mathrm{TiO}}_3,{\mathrm{MnO}}_2$

• D

  ${\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-},{\mathrm{MnO}}_3$