The switching expression corresponding to $f(A,B,C,D)=\Sigma(1, 4, 5, 9, 11, 12)$ is:
$BC’D’ + A’C’D + AB’D$
$ABC’ + ACD + B’C’D$
$ACD’ + A’BC’ + AC’D’$
$A’BD + ACD’ + BCD’$
Answer is : [A]
Gatecse