a) Use a truth table to demonstrate the validity of x+yz=(x+y)(x+z) b) Simplify to a minimum number of literals xyz+x'y+xyz' c) Simplify to a minimum number of literals (x+y)'(x'+y')' d) Reduce the following to 3 literals (x'y'+z)'+z+xy+wz e) Draw the original circuit for part c.