DeMorgan's Law states that

(AB)' = A' + B'

(A+B)' = A'*B

(AB)' = A + B

(AB)' = A' + B

Correct Answer : Option (A) : (AB)' = A' + B'

Explanation : DeMorgan's theorems play a vital role in digital electronics. It gives an equivalency between the logic gates. There are two distinct types of DeMorgan's theorems: the first gives the equivalent of the NAND gate, and the other gives the equivalent of the NOR gate. As per the dual property of DeMorgan's theorem (AB)' = A' + B' & (A+B) = A' * B'

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