The correct answer is: A. it is often necessary to pass data through many layers, which can slow performance significantly.
Layers are a way of organizing code into different sections, each of which is responsible for a specific task. This can make code more modular and easier to understand, but it can also lead to performance problems.
When data is passed from one layer to another, it has to be copied. This can be a slow process, especially if the data is large. In addition, each layer has to add its own overhead, which can also slow down the program.
For these reasons, it is important to use layers judiciously. If you use too many layers, you can end up with a program that is slow and difficult to debug.
Here is a brief explanation of each option:
- Option B: layers support information hiding. This is a good thing, not a drawback. Information hiding is a way of protecting data from unauthorized access. It can be used to prevent bugs and security vulnerabilities.
- Option C: multi-layered programs can be hard to debug because operations tend to be implemented through a series of calls across layers. This is a drawback, but it is not as serious as the performance problem mentioned in option A.
- Option D: none of the mentioned. This is not the correct answer.