$A$ compound is formed by two elements $X$ and $Y$. Atoms of the element $Y$ (as anions) make $ccp$ and those of the element $X$ (as cations) occupy all the octahedral voids. What is the formula of the compound?
- A$XY$
- B$XY_2$
- C$X_2Y$
- D$X_3Y_4$
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