The complex(es), which can exhibit the type of isomerism show by \( \left[ \mathrm{Pt}\left(\mathrm{NH_3}\right)_2 \mathrm{Br_2} \right] \), is (are) \([ \mathrm{en} = \mathrm{H_2NCH_2CH_2NH_2} ]\):
\( \left[ \mathrm{Pt}(\mathrm{en})(\mathrm{SCN})_2 \right] \)
\( \left[ \mathrm{Zn}(\mathrm{NH_3})_2 \mathrm{Cl_2} \right] \)
\( \left[ \mathrm{Pt}(\mathrm{NH_3})_2 \mathrm{Cl_4} \right] \)
\( \left[ \mathrm{Cr}(\mathrm{en})_2 (\mathrm{H_2O})(\mathrm{SO_4}) \right]^+ \)