Which one of the following complex species will obey EAN rule?

1
V(CO)3 (\({\eta ^2}\)- C5H8)(R2C = CR2
2
Co(CO)3 (\({\eta ^2}\)C5H5)
3
Fe(\({\eta ^1}\)C5H5)(\({\eta ^2}\) -C5H5)(CO)3
4
Cr(\({\eta ^6}\) -C6H6)(CO)3

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