12. Among Ni(CO), [Ni(CN),] and [NiCl] (a) Ni(CO), and [Ni(CN),]- are diamagnetic and NiCl is paramagentic (b) Ni(CO), and NiC12- are diamagnetic and Ni(CN), is paramagnetic (c) Ni(CO), is diamagnetic and [Ni(CN)] and NiCl are paramagnetic (d) NiCl and [Ni(CN),]- are diamagnetic and Ni(CO), is paramagnetic