Which one of the following complexes is an outer orbital complex?

$$\begin{gathered} {\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}-{\mathrm{d}}^2{\mathrm{sp}}^3 \\ {\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{4-}-{\mathrm{d}}^2{\mathrm{sp}}^3 \\ {\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}-{\mathrm{d}}^2{\mathrm{sp}}^3 \end{gathered}$$

The compound ${\left[\text{Ni}{\left({\text{NH}}_{\text{3}}\right)}_{\text{6}}\right]}^{\text{2+}}$ involves ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridization and is an outer orbital complex.