The output of a `NAND` gate is `0`

Options

A. If both inputs are zero
B. If one input is `0` and the other input is `1`
C. If both inputs are `1`
D. Either if both inputs are `1` or if one of the inputs is `1` and the other `0`

Answer

C

Explanation

If inputs are `A` and `B` then output for `NAND` gate is
`Y=bar(AB)`
`implies If A=B=1, Y=bar(1.1)=bar(1)=0`