The correct order of the spin-only magnetic moments of the following complexes is :
(I) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Br}_2$
(II) $\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
(III) $\mathrm{Na}_3\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]\left(\Delta_0>\mathrm{P}\right)$
(IV) $\left(\mathrm{Et}_4 \mathrm{~N}\right)_2\left[\mathrm{CoCl}_4\right]$