The geometries of the ammonia complexes of Ni2+, Pt2+ and Zn2+, respcetively, are
octahedral, square planar and tetrahedral
square planar, octahedral and tetrahedral
tetrahedral, square planar and octahedral
octahedral, tetrahedral and square planar
Ni2+→Octahedral→[Ni(NH3)6]2+Pt2+→sq. planar→[Pt(NH3)4]2+Zn2+→Tetrahedral→[Zn(NH3)4]2+