Which one of the following will be the output of the given circuit?

Output of the above circuit can be obtained as

$y = ( \overset{¯}{A ⋅ B} ) ⋅ ( A + B )$

$y = ( \overset{¯}{A} + \overset{¯}{B} ) ⋅ ( A + B )$

$y = \overset{¯}{A} . B + \overset{¯}{B} . A + A . \overset{¯}{A} + B . \overset{¯}{B}$

$y = \overset{¯}{A} . B + \overset{¯}{B} . A + 0 + 0$

$y = \overset{¯}{A} . B + \overset{¯}{B} . A$, which is XOR gate