Spin only magnetic moment of an octahedral complex of ${\mathrm{Fe}}^{2+}$ in the presence of a strong field ligand in BM is:

Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of ${\mathrm{M}}^{+\mathrm{n}}$ ion are provided below; their ${\lambda }_{\max }$ values are marked as $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ respectively. The correct match between the complexes and their ${\lambda }_{\max }$ values is:

(i) ${\left[\mathrm{M}(\mathrm{NCS}{)}_6\right]}^{(-6+\mathrm{n})}$
(ii) ${\left[{\mathrm{MF}}_6\right]}^{(-6+\mathrm{n})}$
(iii) ${\left[\mathrm{M}{\left({\mathrm{NH}}_3\right)}_6\right]}^{\mathrm{n}+}$

For octahedral $\mathrm{Mn}\left(\mathrm{II}\right)$ and tetrahedral $\mathrm{Ni}\left(\mathrm{II}\right)$ complexes, consider the following statements :

$\left(\mathrm{I}\right)$ both the complexes can be high spin.

$\left(\mathrm{II}\right)$ $\mathrm{Ni}\left(\mathrm{II}\right)$ complex can very rarely be of low spin.

$\left(\mathrm{III}\right)$ with strong field ligands, $\mathrm{Mn}\left(\mathrm{II}\right)$ complexes can be low spin.

$\left(\mathrm{IV}\right)$ aqueous solution of $\mathrm{Mn}\left(\mathrm{II}\right) \mathrm{ions}$ is yellow in color.

The correct statements are :