E7A07:

What logical operation does a NAND gate perform?

  1. It produces logic 0 at its output only when all inputs are logic 0
  2. It produces logic 1 at its output only when all inputs are logic 1
  3. It produces logic 0 at its output if some but not all inputs are logic 1
  4. It produces logic 0 at its output only when all inputs are logic 1