In a crystal of substance $A_xB_y$,$A$ atoms are present at each corner of the face-centered cubic $(FCC)$ unit cell,and $B$ atoms are present at each face center. What is the correct formula of the substance $A_xB_y$?

  • A
    $AB_3$
  • B
    $A_4B_3$
  • C
    $A_3B$
  • D
    Cannot be determined

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