$A$ compound is formed by elements $A$ and $B$. Element $B$ forms an $HCP$ lattice,and element $A$ occupies $2/3$ of the tetrahedral voids. What is the formula of the compound formed by $A$ and $B$?
- A$A_2B_3$
- B$A_3B_4$
- C$A_4B_3$
- D$A_3B_5$
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