Which of the following is tautology (1) \( A \wedge(A \vee B) \) (2) \( A \vee(A \vee B) \) (3) ...

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Which of the following is tautology
(1) \( A \wedge(A \vee B) \)
(2) \( A \vee(A \vee B) \)
(3) \( [A \wedge(A \rightarrow B)] \rightarrow B \)
(4) \( B \rightarrow[A \wedge(A \rightarrow B)] \)
\( \mathrm{P} \)
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