(C) $1$. Identify the coordination entity: $[Ni(CN)_4]^{4-}$.$2$. The oxidation state of $Ni$ is calculated as: $x + 4(-1) = -4$,which gives $x = 0$.$

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Potassium tetracyanonickelate $(0)$

(C) $1$. Identify the coordination entity: $[Ni(CN)_4]^{4-}$.$2$. The oxidation state of $Ni$ is calculated as: $x + 4(-1) = -4$,which gives $x = 0$.$3$. The complex is an anionic complex,so the metal name ends in '-ate'.$4$. The correct name is Potassium tetracyanonickelate $(0)$.