E7A07 - Amateur Extra Class

E7A07 : What logical operation does a NAND gate perform?
A It produces a 0 at its output only if all inputs are 0
B It produces a 1 at its output only if all inputs are 1
C It produces a 0 at its output if some but not all inputs are 1
D It produces a 0 at its output only if all inputs are 1
Correct Answer: It produces a 0 at its output only if all inputs are 1