Multiple choice The switching expression corresponding to f(A, B, C, D)= $\sum(1,4,5,9,11,12)$ is BC' D' + A'C'D + AB'D ABC' + ACD + B'C'D ACD' + A' BC' + AC'D' A'BD + ACD' + BCD' Reveal answer Fill a bubble to check yourself A Correct answer Explanation On solving above k-map we get $AB’D+C’D+BC’D’$ So Ans is (1).