Which of the following organometallic compounds is $\sigma $ and $\pi $ bonded?

Question

[Fe($\eta $⁵ $-$ C₂H₅)₂]

K[PtCl₃($\eta $² $-$ C₂H₄)]

[Co(CO)₅NH₃]²⁺

Fe(CH₃)₃

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