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$D < A < C < B$
- B$C < B < D < A$
- C$A < C < B < D$
- D$B < D < A < C$
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