Discussion
NAND gate is also called as
Answer: B
A NAND gate is also called a bubbled OR gate, option (B). By De Morgan's theorem \(\overline{AB} = \bar{A} + \bar{B}\), so a NAND gate behaves as an OR gate with inverted (bubbled) inputs.
A bubbled AND gate (option A) would give \(\bar{A}\bar{B}\), which is the NOR function. A bubbled NOR gate (option C) gives \(\overline{\bar{A}+\bar{B}} = AB\), the AND function, and a bubbled XOR gate (option D) is not a NAND at all.
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