If $A = \{1, 2, 3, 4\}$,$B = \{3, 4, 5, 6\}$,$C = \{5, 6, 7, 8\}$,and $D = \{7, 8, 9, 10\}$,find $A \cup B$.
- A$\{1, 2, 3, 4, 5, 6\}$
- B$\{1, 2, 3, 4, 5\}$
- C$\{3, 4\}$
- D$\{1, 2, 3, 4, 5, 6, 7, 8\}$
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