$A$ logic gate is an electronic circuit which

Consider two $npn$ transistors as shown in the figure. If $0 \, V$ corresponds to false and $5 \, V$ corresponds to true,then the output at $C$ corresponds to:

For the given combination of logic gates,the inputs $A, B$ and $C$ are as follows. If $A=B=C=0$ and $A=B=1, C=0$,then the logic states of output $D$ are respectively:

In the logic circuit diagram,when all the four inputs $A, B, C, D$ are $1$,the outputs $Y_1, Y_2, Y_3$ are respectively $(1, 1, 0)$. When all the inputs $A, B, C, D$ are changed to $0$,the outputs $Y_1, Y_2, Y_3$ respectively change to

To get the truth table shown from the following logic circuit, the gate $G$ should be

The Boolean expression for the given combination of logic gates is