Which of the following is not a valid rule of XOR? (A) 0 XOR 0 = 0 (B) 1 XOR 1 = 1 (C) 1 XOR 0 = 1 (D) B XOR B = 0 Answer: (B) Explanation: XOR gate only returns 1 as the output when both inputs are different and in every other case, it returns 0. So, options (A), (C) and (D) are correct. Option (B) is incorrect.Quiz of this Question