1.Metal–ligand bond order is more than 1 in which of the following complex species?a.[Co(NH3)6]Cl3[\text{Co(NH}_3)_6]\text{Cl}_3[Co(NH3)6]Cl3b.[Cr(CN)6]3−[\text{Cr(CN)}_6]^{3-}[Cr(CN)6]3−c.[Fe(CN)6]4−[\text{Fe(CN)}_6]^{4-}[Fe(CN)6]4−d.[Ni(CO)4][\text{Ni(CO)}_4][Ni(CO)4]Login to continueOnly logged in users canattempt or see the solution.