Which of the following statement is true

  • A

    $ \sim (p \leftrightarrow   \sim q)$ is 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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