can anyone help solve and explain

Question 3 (15 Points): Satisfiability and tautologies (O2) a) For each of the follwing expressions show a satisfying assignment or prove that it is a contradiction. (10 Points) a i) (AVBA -A ii) ((A + B) A (B+C)) + ( AC) iii) ((A + B) A (B+C)) -( AC) 1 b) For each of the statements from a), show the following: if the statement is a tautology, prove it. If not, show an assignment of truth values that makes the proposition false. (5 Points)