An alloy of copper,silver,and gold is found to have copper atoms in an $fcc$ lattice. If silver atoms occupy the edge centers and gold atoms are present at the body center,what is the formula of the alloy?
- A$Cu_4Ag_2Au$
- B$Cu_4Ag_4Au$
- C$Cu_4Ag_3Au$
- D$CuAgAu$
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