Logic Gates

The output $Y$ of the logic circuit shown in the figure is best represented as-

To get an output $y=0$ from the circuit shown in the figure, the input $C$ must be

The boolean equation for the circuit given in figure is 

For what value of $A,B$  and $C$,  the output $Y=1$

To get an $\mathrm{OR}$ gate from a $\mathrm{NAND}$ gate, we need

The Boolean equation for the circuit given in the figure is

Mark the correct statement.