The Boolean equation $\overline{A} \cdot \overline{B} = \dots$

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.

The following figure shows a logic gate circuit with two inputs $A$ and $B$ and the output $C$. The voltage waveforms of $A$,$B$,and $C$ are as shown below. The logic circuit gate is

The output of an $OR$ gate is $1$:

Which logic gate is represented by this figure?

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