Which of the following statements are true?

In ${\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right]}^{2+}$ the cis form is optically inactive while trans form is optically active

In ${\left[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$, geometrical isomerism does not exist while optical isomerism exist

In Mabcd square planar complexes show both optical as well as geometrical isomerism

In Mabcd tetrahedral complex, optical isomerism can not be observed