The statement among the following that is a tautology is :

Consider the statement :
‘‘For an integer n, if n³ – 1 is even, then n is odd.’’
The contrapositive statement of this statement is :

The negation of the Boolean expression p $$ \vee $$ (~p $$ \wedge $$ q) is equivalent to :

The statement
$$\left( {p \to \left( {q \to p} \right)} \right) \to \left( {p \to \left( {p \vee q} \right)} \right)$$ is :