In a binary compound,atoms of element $A$ form a $hcp$ structure and those of element $M$ occupy $2/3$ of the tetrahedral voids of the $hcp$ structure. The formula of the binary compound is

  • A
    $M_2 A_3$
  • B
    $M_4 A_3$
  • C
    $M_4 A$
  • D
    $MA_3$

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