A logic gate circuit has two inputs $$A$$ and $$B$$ and output $$Y$$. The voltage waveforms of $$A$$, $$B$$ and $$Y$$ are shown. The logic gate circuit is

We need to identify the logic gate from the voltage waveforms of inputs $$A$$, $$B$$ and output $$Y$$.

From the waveforms, let us construct the truth table by reading the HIGH (1) and LOW (0) values of $$A$$, $$B$$, and $$Y$$ at each time interval:

Interval 1: $$A = 0, B = 0 \Rightarrow Y = 0$$

Interval 2: $$A = 1, B = 0 \Rightarrow Y = 0$$

Interval 3: $$A = 1, B = 1 \Rightarrow Y = 1$$

Interval 4: $$A = 0, B = 1 \Rightarrow Y = 0$$

Now let us compare this with the truth tables of the given gates:

AND gate truth table:

$$A = 0, B = 0 \Rightarrow Y = 0$$

$$A = 1, B = 0 \Rightarrow Y = 0$$

$$A = 1, B = 1 \Rightarrow Y = 1$$

$$A = 0, B = 1 \Rightarrow Y = 0$$

The output $$Y$$ is HIGH only when both $$A$$ and $$B$$ are HIGH. This matches perfectly with the AND gate truth table.

The correct answer is Option A: AND gate.