7. One of De Morgan's theorems states that X +Y-X-Y. Simply stated, this means ans that logically there is no difference between: a) a NOR and an AND gate with inverted inputs b) a NAND and an OR gate with inverted inputs c) an AND and a NOR gate with inverted inputs dy a NOR and a NAND gate with inverted inputs 8. How many gates would be required to implement the following Boolean expression before simplification? a) 1 d) 5