The question refers to a logic circuit shown and asks for the corresponding output waveform at $Y$, with options $A,B,C,D$.

However, in the provided prompt:

• the circuit diagram is missing, and
• the waveform options $A,B,C,D$ are also missing.

So the answer cannot actually be derived from the available information.

Why it cannot be solved

To determine the waveform at $Y$, we would need:

1. the exact arrangement of logic gates,
2. the input waveforms applied to the circuit,
3. the timing relationship of those inputs, and
4. the waveform diagrams corresponding to options $A,B,C,D$.

Without these, there is no valid way to compute or verify the output.

Conclusion

Because the essential figure and options are absent, the problem is incomplete and cannot be solved step-by-step from the given data alone.

The stored correct answer is marked as B, but I cannot independently verify it without the missing diagram.