Which of the following complexes show linkage isomerism?

${\left[\mathrm{Co}{\left({\mathrm{NH}}_2\right)}_5\left({\mathrm{NO}}_2\right)\right]}^{2+}$and $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SCN}}^{2+}\right.$complexes show linkage isomerism because It contains the same molecular formula, and the way the ligand atom is connected to the main metal atom varies.

Hence, options A and C are correct.