Which output expression might indicate a product-of-sums circuit construction?

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Question
Which output expression might indicate a product-of-sums circuit construction?
Options
A.
B.
C.
D.

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Boolean Algebra and Logic Simplification problems

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3. Determine the binary values of the variables for which the following standard POS expression is equal to 0.
Options
A. (0 + 1 + 0)(1 + 0 + 1)
B. (1 + 1 + 1)(0 + 0 + 0)
C. (0 + 0 + 0)(1 + 0 + 1)
D. (1 + 1 + 0)(1 + 0 + 0)

7. One of De Morgan's theorems states that . Simply stated, this means that logically there is no difference between:
Options
A. a NOR and an AND gate with inverted inputs
B. a NAND and an OR gate with inverted inputs
C. an AND and a NOR gate with inverted inputs
D. a NOR and a NAND gate with inverted inputs

9. A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct?
Options
A. A = 0, B = 0, C = 1, D = 1
B. A = 1, B = 1, C = 0, D = 0
C. A = 1, B = 1, C = 1, D = 1
D. A = 1, B = 0, C = 1, D = 0

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