Which of the following complex ions has electrons that are symmetrically filled in both t_2g and eg orbitals ?

• A

  ${\left[{\text{CoF}}_6\right]}^{3-}$

• B

  ${\left[\text{Co}{\left({\text{NH}}_{\text{3}}\right)}_{\text{6}}\right]}^{2-}$

• C

  ${\left[\text{Mn}{\left(\text{CN}\right)}_{\text{6}}\right]}^{4-}$

• D

  ${\left[{\text{FeF}}_{\text{6}}\right]}^{3-}$