$A$ solid is made of two elements $X$ and $Y$. Atoms of $X$ are in $FCC$ arrangement and $Y$ atoms occupy all tetrahedral sites. What is the possible formula of the compound?

  • A
    $XY_3$
  • B
    $XY_4$
  • C
    $XY$
  • D
    $XY_2$

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