Gold numbers of protective colloids $A, B, C$ and $D$ are $0.50, 0.01, 0.10$ and $0.005$,respectively. The correct order of their protective powers is
- A$A < C < B < D$
- B$C < B < D < A$
- C$A < C < B < D$
- D$D < B < C < A$
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