Which of the following statements is true?

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(C) $1$. In $[PtCl_2(NH_3)_2]^{2+}$,both $cis$ and $trans$ isomers are square planar and possess a plane of symmetry,making them optically inactive.$2

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In $[Fe(C_2O_4)_3]^{3-}$,geometrical isomerism does not exist while optical isomerism exists.

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(C) $1$. In $[PtCl_2(NH_3)_2]^{2+}$,both $cis$ and $trans$ isomers are square planar and possess a plane of symmetry,making them optically inactive.$2$. $Mabcd$ square planar complexes show geometrical isomerism ($3$ isomers) but do not show optical isomerism due to the presence of a molecular plane of symmetry.$3$. $[Fe(C_2O_4)_3]^{3-}$ contains three bidentate ligands. It does not show geometrical isomerism because all positions are equivalent for bidentate ligands,but it exists as two non-superimposable mirror images (enantiomers),thus showing optical isomerism.$4$. $Mabcd$ tetrahedral complexes are chiral and can exhibit optical isomerism.

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