The correct order of the spin-only magnetic moments of the following complexes is :

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) $\left(\mathrm{Et}_{4} \mathrm{~N}\right)_{2}\left[\mathrm{CoCl}_{4}\right]$