4. Which of the waveforms shown below can be generated by the output QB of the synchronous counter shown? (QA is least significant) 



  
    CLOCK _-__-__-__-__-__-__-__-__-__-__-__-__-__-__-__-__-_ 
      QB1 __---------_________---------_________---------____ 
      QB2 __---___---___---___---___---___---___---___---___- 
      QB3 __------------____________------------____________- 
      QB4 __------______------______------______------______- 
      QB5 __------------------------________________________-

  1. QB1
  2. QB2
  3. QB3
  4. QB4
  5. QB5

3 is WRONG. This waveform is generated by output QC.

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