Which of these sets of logic gates are designated as universal gates?

1.	Which of these sets of logic gates are designated as universal gates?
A.	NOR, NAND.
B.	XOR, NOR, NAND.
C.	OR, NOT, AND.
D.	NOR, NAND, XNOR.
Answer» B. XOR, NOR, NAND.

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Which of these sets of logic gates are designated as universal gates?

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