Among (a) - (d), the complexes that can display geometrical isomerism are
(a) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]^{+}$
(b) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right) \mathrm{Cl}_5\right]^{-}$
(c) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}\left(\mathrm{NO}_2\right)\right]$
(d) $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4 \mathrm{ClBr}\right]^{2+}$
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