Complex showing cis-trans isomerism is :

$\text{ (a) Square planar }\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_3\mathrm{Cl}\right]\mathrm{Cl},{\mathrm{Ma}}_3\mathrm{b}\text{ does not show cis trans isomerism. }$
$\text{ (b) }\left[\mathrm{Zn}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2\right]\text{, tetrahedral does not show cis trans isomerism. }$
$\text{ (c) }{\mathrm{K}}_3\left[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right],\mathrm{M}(\mathrm{AA}{)}_3\text{ does not show cis trans isomerism. }$
$\text{ (d) }\mathrm{Co}(\mathrm{gly}{)}_3;\mathrm{M}(\mathrm{AB}{)}_3\text{ show cis trans isomerism. }$