If $A=\{3, 6, 9, 12, 15, 18, 21\}, B=\{4, 8, 12, 16, 20\}, C=\{2, 4, 6, 8, 10, 12, 14, 16\}, D=\{5, 10, 15, 20\};$ find $A-D$.
- A$\{3, 6, 9, 12, 18, 21\}$
- B$\{3, 6, 9, 12, 15, 18, 21\}$
- C$\{3, 6, 9, 12, 15, 18\}$
- D$\{6, 9, 12, 18, 21\}$
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