Which one of the following complex exhibits linkage isomerism ?

Complexes containing ambidentate ligands exhibit linkage isomerism.

${\mathrm{NO}}_2^{-},{\mathrm{ONO}}^{-},{\mathrm{SCN}}^{-},{\mathrm{NCS}}^{-},{\mathrm{CN}}^{-},{\mathrm{NC}}^{-}$ are some important ambidentate ligands. 

$\therefore \left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]{\mathrm{SO}}_4\mathrm{and} \left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{NO}}_2\right)\right]{\mathrm{SO}}_4$are linkage isomers.