Which of the following pairs are universal gates?

The Boolean equation of a logic gate is $Y = \bar{A} \cdot B + A \cdot \bar{B}$. Identify the logic gate and describe its construction using $OR$,$AND$,and $NOT$ gates.

For the given logic gates combination,the correct truth table will be

Which one of the following logic gates is called a Universal gate?

If the output of a $NAND$ gate is given as input to a $NOT$ gate, the resultant gate is

The combination of the gates shown in the figure below produces: