The $d-$electron configuration of $[Ru(en)_3]Cl_2$ and $[Fe(H_2O)_6]Cl_2,$ respectively are :

• A
  $t_{2g}^4 e_g^2$ and $t_{2g}^6 e_g^0$
• B
  $t_{2g}^6 e_g^0$ and $t_{2g}^6 e_g^0$
• C
  $t_{2g}^6 e_g^0$ and $t_{2g}^4 e_g^2$
• D
  $t_{2g}^4 e_g^2$ and $t_{2g}^4 e_g^2$