Which of the following complex compound is low spin, inner orbital, diamagnetic complex ?

$$\begin{gathered} \left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_2 \mathrm{paramagnetic}, \mathrm{outer} \mathrm{orbital} \mathrm{complex}, {\mathrm{sp}}^3{\mathrm{d}}^2 \\ {\mathrm{K}}_3\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]\text{ paramagnetic, inner orbital complex, }{\mathrm{d}}^2{\mathrm{sp}}^3 \\ {\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]\text{ diamagnetic, inner orbital complex, }{\mathrm{d}}^2{\mathrm{sp}}^3 \\ \left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_3\text{ paramagnetic, inner orbital, }{\mathrm{d}}^2{\mathrm{sp}}^3 \end{gathered}$$