The subsequent problems deal with the circuit below:
Note: Each question is independent and doesn't depend on results from previous questions. The only values known initially are the values provided in each question.If B=1 while D changes state from 1 to 0, X will
A. become (or remain) 0
B. remain unchanged (regardless of whether the initial value is 0 or 1)
C. become (or remain) 1
D. be uncertain
Answer: B
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