What is the coordination geometry around the manganese atom in decacarbonyldimanganese$(0)$?

The hybridisation and magnetic behavior of the complex $[Ni(CO)_4]$ are

Statement $1$: $[Ti(H_2O)_6]^{4+}$ is coloured while $[Sc(H_2O)_6]^{3+}$ is colourless.
Statement $2$: $d-d$ transition is not possible in $[Sc(H_2O)_6]^{3+}$.

Nickel $(Z = 28)$ combines with a uninegative monodentate ligand $X^{-}$ to form a paramagnetic complex $[NiX_4]^{-2}.$ The number of unpaired electron$(s)$ in the nickel and geometry of this complex ion are,respectively $:$

The example of $dsp^2$ hybridisation is

In $[Cu(NH_3)_4]SO_4$,$Cu$ has the following hybridization: