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 $D - C$.
- A$\{5, 15\}$
- B$\{5, 15, 20\}$
- C$\{5, 10, 15\}$
- D$\{10, 20\}$
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