In which one of the following metal carbonyls, $\mathrm{CO}$ forms a bridge between metal atoms?

Question

$\left[\mathrm{Os}_3(\mathrm{CO})_{12}\right]$

$\left[\mathrm{Ru}_3(\mathrm{CO})_{12}\right]$

$\left[\mathrm{Mn}_2(\mathrm{CO})_{10}\right]$

$\left[\mathrm{Co}_2(\mathrm{CO})_8\right]$

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