Choose the correct of M – C bond order in the following molecule and ions

Question

[Ni {(CO)}_{4}] > {[Co ({CO}_{4})]}^{– 1} > {[Fe {(CO)}_{4}]}^{2 -}

[Ni {(CO)}_{4}] = {[Co ({CO}_{4})]}^{– 1} = {[Fe {(CO)}_{4}]}^{2 -}

{[Co ({CO}_{4})]}^{– 1} > {[Fe {(CO)}_{4}]}^{2 -} > [Ni {(CO)}_{4}]

$[Ni ({CO}_{4})] < {[Co {(CO)}_{4}]}^{– 1} < {[Fe {(CO)}_{4}]}^{2 -}$

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