Which of the following statements is a tautology?

  • A
    $(\sim p \vee \sim q) \vee (p \vee \sim q)$
  • B
    $(\sim p \vee \sim q) \wedge (p \vee \sim q)$
  • C
    $\sim p \wedge (\sim p \vee \sim q)$
  • D
    $\sim q \wedge (\sim p \vee \sim q)$

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