
Answer & explanation
Correct answer: option 3
$\text{To get final output as 1, the output of OR gate must be 1 and C must be 1.}$
$\text{So, a = 1, b =0 or a=0, b=1.}$

Correct answer: option 3
$\text{To get final output as 1, the output of OR gate must be 1 and C must be 1.}$
$\text{So, a = 1, b =0 or a=0, b=1.}$