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A device that tests whether the product of two two bit numbers is equ

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A device that tests whether the product of two two-bit
numbers is equals to \"0\" is to be designed using
combinational logic devices. The circuit can be conveived
as a Boolean function F(A,B,C,D) that is equal to \"1\"
whenever the product of the two bits numbers AB and CD
is zero. For example if AB =11 (3 decimal) and CD is 10
(two decimal) the product will be a binary number different
from \"0\" (decimal 6) and therefore the output of
F(A,B,C,D) will be \"0\" whereas if AB =11 (3 decimal) and
CD is 00 (zero decimal) the product will be \"0\" (zero
decimal) and therefore the output of F(A,B,C,D) will be
\"1\". Which of the given functions provide a minimum
expression for the function F(A,B,C,D)?A\'B + CD\'(A+B)\'
+ (C+D)\'ABC + A\'D\'None of the above
Solution
(A+B)^+(C+D)^ (^ indicates compliment)

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A device that tests whether the product of two two -bit numbers is equals to \"0\" is to be designed using combinational logic devices. The circuit can be conveived as a Boolean function F(A,B,C,D) that is equal to \"1\" whenever the product of the two bits numbers AB and CD is zero. For example if ...
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