Discussion
For a NAND gate having two inputs the output is low (0) only :
Answer: A
The output of a two-input NAND gate is low only when both inputs are high.
NAND is AND followed by NOT: \(Y = \overline{A \cdot B}\). The AND of the inputs is 1 only when A = 1 and B = 1, so the NAND output is 0 only in that one case and 1 for the other three input combinations.
| A | B | Y |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
Both inputs low, or one high and one low, all give a high output, so the other options describe cases where the output is 1.
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