The waveforms $A$ and $B$ given below are given as input to a NAND gate. Then its logic output $Y$ is

• A

  for $t_1$ to $t_2 ; Y=0$
• B

  for $t_2$ to $t_3 ; Y=1$
• Correct answer
  C

  for $t_3$ to $t_4 ; Y=1$
• D

  for $t_4$ to $t_5 ; Y=0$

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