Which of the following pairs represents linkage isomers?

• A

  $\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]\left[{\mathrm{PtCl}}_4\right]\hspace{0.33em}\mathrm{and}\hspace{0.33em}\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_4\right]\left[{\mathrm{CuCl}}_4\right]$

• B

  $\left[\mathrm{Pd}{\left({\mathrm{Ph}}_3\right)}_2\right]{\left(\mathrm{NCS}\right)}_2\hspace{0.33em}\mathrm{and}\hspace{0.33em}\left[\mathrm{Pd}{\left({\mathrm{Ph}}_3\right)}_2{\left(\mathrm{SCN}\right)}_2\right]$

• C

  $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\right]{\mathrm{NO}}_3{\mathrm{SO}}_4\text{\hspace{0.33em}and\hspace{0.33em}}\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]{\mathrm{NO}}_3$

• D

  $\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_4\right]\mathrm{Br}\text{\hspace{0.33em}and\hspace{0.33em}}\left[{\mathrm{PtBr}}_2{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{Cl}}_2$