Which of the following Boolean expression is a tautology?

Let F₁(A, B, C) = (A $$ \wedge $$ $$ \sim $$ B) $$ \vee $$ [$$\sim$$C $$\wedge$$ (A $$\vee$$ B)] $$\vee$$ $$\sim$$ A and
F₂(A, B) = (A $$\vee$$ B) $$\vee$$ (B $$ \to $$ $$\sim$$A) be two logical expressions. Then :

The contrapositive of the statement "If you will work, you will earn money" is :

The statement A $$ \to $$ (B $$ \to $$ A) is equivalent to :