Which of the following statements is true?

  • A
    $\sim (p \leftrightarrow \sim q)$ is a tautology
  • B
    $\sim (p \leftrightarrow \sim q)$ is equivalent to $p \leftrightarrow q$
  • C
    $(p \wedge \sim q)$ is a fallacy
  • D
    $(p \wedge \sim q) \wedge (\sim p \wedge q)$ is a tautology

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