$A$ compound is formed by two elements $X$ and $Y$. Atoms of the element $Y$ (anions) form an $hcp$ structure and atoms of the element $X$ (cations) occupy all the tetrahedral voids. Determine the formula of the compound.
- A$XY$
- B$X_2Y$
- C$XY_2$
- D$X_2Y_3$
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