Consider the following complexes
(A) [CoCl(NH3)5]2+
(B) [Co(CN)6]3-
(C) [Co(NH3)5(H2O)]3+
(D) [Cu(H2O)4]2+
The correct order of A, B, C and D in terms of wavenumber of light absorbed is :
1
C < D < A < B
2
D < A < C < B
3
A < C < B < D
4
B < C < A < D