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Which of the following obey18`e^(-)`rule?

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Which of the following obey18`e^(-)`rule?
A. `Cr(CO)_(6)`
B. `Ni(CO)_(4)`
C. `Cr(C_(6)H_(6))_(2)`
D. `Fe(C_(5)H_(5))_(2)`
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Correct Answer - a,b,c,d
Consider outer electronic configuration.
Eg : `[Cr(CO)_(6)] : Cr(O) : d^(4) s^(2) , 6 + 6 xx 2 = 18 e^(-) C_(6) H_(6)` and `C_(5)H_(5)^(-)` are `6pi e^(-)` systems .
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