part c only

2.17 Obtain the truth table for the following four-variable functions, and express each function in sum-of-minterms afd product-of-maxterms form: (a)" (ac + b)(ab + d) (b) (a' + c' + d )(ab + cd) (c) (b + c'd')(a + bc) (d) a'b'c' + acd + ab'd' + b'cd