Atoms of element $B$ form $hcp$ lattice and those of the element $A$ occupy $2/3$ of tetrahedral voids. What is the formula of the compound formed by the elements $A$ and $B$?
- A$A_4B_3$
- B$A_3B_4$
- C$A_2B_3$
- D$A_3B_2$
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