(Solved): pls solve and explain Construct the d-orbital energy diagram of the octahedral complex [CoCl6]4 ...

Construct the $d$-orbital energy diagram of the octahedral complex ${\left[{\mathrm{CoCl}}_6\right]}^{4?}$. Select the number of unpaired $d$ electrons in ${\left[{\mathrm{CoCl}}_6\right]}^{4?}$. Calculate the ligand field stabilization energy (LFSE) of this octahedral complex with respect to ${?}_0$. Consider the energy of electrons if placed in the diagram. LFSE: