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


Answer: (A)

Explanation: The K-Map for the boolean function of four variables can be drawn as:

f (A,B,C,D) = BC\’D\’ + A\’C\’D + AB\’D

So, option (A) is correct.

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