Indicate the complex ion which shows geometrical isomerism.
Octahedral complexes of the type [MX2L4] where X and L are unidentate ligands or
[MX2(L-L)2] where X is unidentate and L-L represents a bidentate ligand show geometrical isomerism. They exist as cis or trans. The other options given do not fall under this category and hence do not show geometrical isomerism

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