The correct answer is: D. 0’s or 1’s
A NOR gate is a digital logic gate that implements logical NOR, that is, the negation of the logical OR function. It produces an output of 0 (false) if any of its inputs are 1 (true), and an output of 1 (true) if all of its inputs are 0 (false).
In other words, a NOR gate recognizes only the input word whose bits are 0’s or 1’s. If any of the bits in the input word is 1, the output of the NOR gate will be 0. If all of the bits in the input word are 0, the output of the NOR gate will be 1.
Option A is incorrect because a NOR gate does not recognize only the input word whose bits are 0’s and 1’s. A NOR gate recognizes only the input word whose bits are 0’s or 1’s.
Option B is incorrect because a NOR gate does not recognize only the input word whose bits are 1’s. A NOR gate recognizes only the input word whose bits are 0’s or 1’s.
Option C is incorrect because a NOR gate does not recognize only the input word whose bits are 0’s. A NOR gate recognizes only the input word whose bits are 0’s or 1’s.
Option E is incorrect because a NOR gate does recognize the input word whose bits are 0’s or 1’s.