GATE | Gate IT 2007 | Question 38

The following expression was to be realized using 2-input AND and OR gates. However, during the fabrication all 2-input AND gates were mistakenly substituted by 2-input NAND gates.
(a.b).c + (a’.c).d + (b.c).d + a. d
What is the function finally realized ?
(A) 1
(B) a’ + b’ + c’ + d’
(C) a’ + b + c’ + d’
(D) a’ + b’ + c + d’

Answer: (C)


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