If $$\text{Ni}^{2+}$$ is replaced by $$\text{Pt}^{2+}$$ in the complex ion $$[\text{NiCl}_2\text{Br}_2]^{2-}$$, which of the following would change? I. Magnetic moment II. Geometry III. Geometrical isomerism IV. Optical isomerism

A

I, II, III

B

II, III

C

I, II

D

II, III, IV