Let $U$ be the universal set and $A \cup B \cup C = U$. Then $\{ (A - B) \cup (B - C) \cup (C - A)\} '$ is equal to

  • A

    $A \cup B \cup C$

  • B

    $A \cup (B \cap C)$

  • C

    $A \cap B \cap C$

  • D

    $A \cap (B \cup C)$

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