In an $fcc$ arrangement of $A$ and $B$ atoms, $A$ atoms are at the corners of the unit cell and $B$ atoms are at the face centers. If one of the $A$ atoms is missing from one corner, what is the simplest formula of the compound?
- A$A_7B_8$
- B$A_7B_{24}$
- C$A_7B_3$
- D$AB_3$
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