Given below are four logic gate symbols (figure). Those for $OR$,$NOR$ and $NAND$ are respectively:

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

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

Three logic gates are connected as shown in the figure. If the inputs are $A = 1$ and $B = 1$, then the values of $y_1$ and $y_2$ respectively are

You are given two circuits as shown in the figure,which consist of $NAND$ gates. Identify the logic operation carried out by the two circuits.

The truth table for the following logic circuit is