What is the correct electronic configuration of the central atom in ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$ based on crystal field theory?

• A

  $e_g^4 t_{2g}^2$

• B

  ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$

• C

  $t_{2g}^6{e}_g^0$

• D

  $e_g^3 t_{2g}^3$