Which of the following Boolean expressions is a tautology?

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

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