If a signal passing through a gate is initiated by sending low into one of the inputs and the output is high, the gate is
For a NAND gate, if any input is low (0), the output is always high (1), whatever the other inputs are. So a single low input guarantees a high output.
For NOR, AND and OR, one low input doesn't decide whether the output is high.
Answer: (B) NAND
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