VBT model for $\left[\mathrm{MnCo}(\mathrm{CO}{)}_9\right]$  suggest:

Here,

$\left[(\mathrm{CO}{)}_5\mathrm{Mn}-\mathrm{Co}(\mathrm{CO}{)}_4\right]$.

This is a heteronuclear carbonyl in which the hybridisation of Mn is $d^{2}s{p}^3$.
The hybridisation of Co is $ds{p}^3$.

Also, the Mn-Co bond is formed by overlapping of the atoms Mn and Co hybrid orbital, where each orbital bearing an unpaired electron.

Thus, all are correct options.