Which of the following has both a plane of symmetry $(POS)$ and a centre of symmetry $(COS)$?
- A$A$. $trans-1,4-dimethyl-2,5-dichlorocyclohexa-1,4-diene$
- B$B$. $1,2,3,4,5,6-hexachlorocyclohexane$ (all-cis isomer)
- C$C$. $trans-2,5-dimethyl-1,4-dioxane$
- D$D$. None of these
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