5 views

The output of a logic gate is ‘$1$’ when all its inputs are at logic ‘$0$’. Then gate is either

1. a $\text{NAND}$ or an $\text{EX-OR}$ gate
2. a $\text{NOR}$ or an $\text{EX-NOR}$ gate
3. an $\text{OR}$ or an $\text{EX-NOR}$ gate
4. an $\text{AND}$ or an $\text{EX-OR}$ gate