Which of the following statements is correct for the complexes $Ni(CO)_4$ and $[Ni(CN)_4]^{2-}$?

  • A
    Both have the same oxidation state of $Ni$.
  • B
    Both have a tetrahedral geometry.
  • C
    They exhibit tetrahedral and square planar geometries,respectively.
  • D
    Both exhibit square planar geometry,respectively.

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