Let $U = \{1, 2, 3, 4, 5, 6, 7, 8, 9\}$,$A = \{1, 2, 3, 4\}$,$B = \{2, 4, 6, 8\}$,and $C = \{3, 4, 5, 6\}$. Find $(A \cup C)'$.

  • A
    $\{7, 8, 9\}$
  • B
    $\{1, 2, 3, 4, 5, 6\}$
  • C
    $\{1, 2, 3, 4, 5, 6, 7, 8, 9\}$
  • D
    $\{1, 2, 3, 4\}$

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