The correct order of M-C bond length is?

1
[V(CO)6]- < [Mn(CO)6]+ < [Cr(CO)6]
2
[Cr(CO)6] < [Mn(CO)6]+ < [V(CO)6]-
3
[Mn(CO)6]+ < [Cr(CO)6] < [V(CO)6]-
4
[V(CO)6]- < [Cr(CO)6] < [Mn(CO)6]+

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