For the logic circuit shown, the truth table is :

(1) A B Y
0 0 0
0 1 0
1 0 0
1 1 1
(2)
A B Y
0 0 0
0 1 1
1 0 1
1 1 1
(3)
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
(4)
A B Y
0 0 1
0 1 0
1 0 0
1 1 0