For the combination of gates given below the output y is high if

Options

A. a=0,b=1,c=0
B. A=1,B=0
C. A=0,B=0
D. A=1,B=1

Explanation

Here, `X_1 = A + B`
`X_2 = A. X_1 = A. (A+B)`
and `Y = bar(B + X_2)`
The truth table is

So, the output is high only when A = 0 andB = 0