An $AND$ gate

For the circuit shown above,the equivalent $\text{GATE}$ is:

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

In the following digital logic circuit,the output $Y$ will be ' $1$ ' for inputs:

In the circuit shown, inputs $A$ and $B$ are in states $1$ and $0$ respectively. What is the only possible stable state of the outputs $X$ and $Y$?

The logic circuit in the figure is equivalent to