Coordination Compounds

Consider the following complexes

(A) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}\), (B) \(\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}\), (C) \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}\), (D) \(\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}\)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is :