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For each of the positive edge-triggered $\text{J-K}$ flip flop used in the following figure, the propagation delay is $\Delta T$.


Which of the following waveforms correctly represents the output at $\mathrm{Q}_{1}?$ 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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