Identify the correct output signal $Y$ in the given combination of gates for the given inputs $A$ and $B$ shown in the figure.

• A

  
  
• B

  
  
• C

  
  
• Correct answer
  D

  
  

Solution

Given circuit can be shown as below Output, $Y=\overline{(\bar{A})(\bar{B})}=\bar{A}+\bar{B}=A+B$ The truth table will be The corresponding input and output waveforms are shown below.

Hence, the correct answer is option: 'D'.