Which of the following complexes follow EAN rule? 

Effective atomic number Value is 36 $\mathrm{Ni}(\mathrm{CO}{)}_4,\mathrm{Fe}(\mathrm{CO}{)}_5,{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$

$\text{ (b) }\left[\mathrm{V}\left({\mathrm{CO}}_6\right]\mathrm{EAN}=35\right.$

The complexes $\mathrm{Ni}(\mathrm{CO}{)}_4,\mathrm{Fe}(\mathrm{CO}{)}_5,{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$ follow EAN rule.

Hence correct option is (a, c, d).