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For NAND gate: output is 0 when:

AAny input is 0
BALL inputs are 1 (NAND = NOT AND)
CAny input is 1
DNever
Answer & Solution
Correct answer: B. ALL inputs are 1 (NAND = NOT AND)
**NAND truth table:** only outputs 0 when ALL inputs are 1. Equivalent: NOT(A AND B). NAND is 'universal gate' — any Boolean function can be built from NAND alone.
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