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