From the magnetic behaviour of [NiCl₄]^2– (paramagnetic) and [Ni(CO)₄] (diamagnetic), choose the correct geometry and oxidation state.

[NiCl₄]^2– : Ni^II, square planar

[Ni(CO)₄] : Ni(0), square planar 

[NiCl4]2–  : Ni^II, tetrahedral

[Ni(CO)4] : Ni(0), tetrahedral

[NiCl4]2–  : Ni^II, tetrahedral

[Ni(CO)4]  : Ni^II, square planar

[NiCl4]2–  : Ni(0), tetrahedral

[Ni(CO)4]  : Ni(0), square planar