Correct statement(s) is/are regarding following compounds :

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The compounds are geometric isomers due to restricted rotation around double bonds. They are configurational isomers as their spatial arrangement differs and can only be changed by breaking bonds. However, they are not all optical isomers; only Q and R are chiral (asymmetric carbons) and resolvable into enantiomers. S is achiral (meso compound) and not resolvable.
Final answer: All are configurational isomers of each other. Only two Q & R are resolvable.