Consider the following complexes : [Ni(CN)4]2- (A) and [Ni(CO)4] (B). Both of them possess similar magnetic behaviour but their geometries are different. The geometries of (A) and (B) are
(a) (A) has tetrahedral structure, (B) has square planar structure
(b) (A) has tetrahedral structure, (B) has trigonal planar structure
(c) (A) has square planar structure, (B) has tetahedral structure
(d) (A) has tetrahedral structure, (B) has trigonal pyramidal structure
