\([IrF_3 (H_2O)_2(NH_3)] \); Hyb. \(:\) \(d^2sp^3;\) exhibits geometrical isomerism but does not exhibit optical isomerism.
\([NiCl_2(en)_2]\) ; Hyb. \(:\) \(sp^3d^2;\) exhibits both geometrical isomerism and optical isomerism.
\([Co(CN)_2(ox)_2]^{3-}\) ; Hyb. \(: d^2sp^3 ;\) exhibits both geometrical isomerism and optical isomerism.
$(A)$ $\left. Na _{4}\left[ Fe ( CN )_{5} NOS \right)\right]$
$(B)$ $Na _{4}\left[ FeO _{4}\right]$
$(C)$ $\left[ Fe _{2}( CO )_{9}\right]$