Among $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right],{\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-},{\left[{\mathrm{NiCl}}_4\right]}^{2-}$ species, the hybridization states at the Ni atom are, respectively

(At. no. of Ni = 28)

• A

  ${\mathrm{sp}}^3,{\mathrm{sp}}^3,{\mathrm{dsp}}^2$

• B

  ${\mathrm{dsp}}^2,{\mathrm{sp}}^3,{\mathrm{sp}}^3$

• C

  ${\mathrm{sp}}^3,{\mathrm{dsp}}^2,{\mathrm{dsp}}^2$

• D

  ${\mathrm{sp}}^3,{\mathrm{dsp}}^2,{\mathrm{sp}}^3$