Consider the following metal complexes : $$ \begin{aligned} & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right]^{3+}} \\ & {\left[\mathrm{CoCl}(\mathrm{NH} 3)_5\right]^{2-1}} \\ & {\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}} \end{aligned} $$ The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)