What does $925$ sterling silver mean in terms of its alloy composition?
- A$7.5\% Ag$ and $92.5\% Cu$
- B$92.5\% Ag$ and $7.5\% Cu$
- C$9.25\% Cu$ and $90.75\% Ag$
- D$9.25\% Ag$ and $90.75\% Cu$
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