In a JK flip-flop the output Qn is '1'. It does not change

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In a JK flip-flop the output Qn is '1'. It does not change when a clock pulse is applied. The possible combination of Jn and Kn could be (X denotes don't care)—

1. 'X' and '0'
2. 'X' and '1'
3. '0' and 'X'
4. 'Y' and 'X'

Correct Option: A

NA