Which of the following complex has a possibility to exist as meridional isomer?

Question

$\mathrm{[Pt(NH_3)_2Cl_2]}$

$\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]$

$\left[\mathrm{Co}(\mathrm{en})_{3}\right]$

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]$

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