4. Simplify the following Boolean Equations. For simplification, it should use the fewest literals (variables) and disjunctive normal form (disjunctive). You my use any method: proofing, algorithms, or even truth tables, though show your work. a) (ab)'a'c) (6'c') (5 points) b) p'q'r's'+p'q'rs'+p'ar's'+p'ers'+pq'r's'+pq'rs'Hpqr's'+pqr's (5 points)