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$A_3B$
- DCannot be determined
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