Question 4 Realize the function f(A. B. C. D)-A"C" + A,B' D' + ACD + A'BD. (a) Use a single 8-to-1 multiplexer with an active low enable and an active high out- put. Use A, C, and D as the select inputs where A is the most significant and D is the least significant. active low put and a minimum of additional gates Show the function expansion both alge- (b) Repeat Part (a) assuming the multiplexer enable is active high and output is (c) Use a single 4-to-1 multiplexer with an active low enable and an active high out- braically and on a Karnaugh map