5. Using Karnaugh maps, find the minimum sum-of-products expression for each function (m denotes minterm and d denotes don't care term). [20 points) (a) f(a, b, c, d) = m(0,1, 8,14) + d(2,11,13) (b) f(a, b, c, d) = m(0,5,12,14) + d(7,9,10,11)