The correct answer is: C. all of the mentioned
A layered architecture is a software design approach that organizes the software into discrete layers. Each layer is responsible for a specific set of tasks and interacts with the layers above and below it. This approach has several advantages, including:
- Increased modularity: Each layer can be developed and tested independently, which makes it easier to maintain and update the software.
- Reduced complexity: The layers can be designed to hide the complexity of the lower layers, making it easier for developers to understand and work with the software.
- Improved performance: The layers can be optimized for specific tasks, which can improve the overall performance of the software.
In a layered architecture, each layer is allowed to depend on the layer above it being present and correct. This is because the layers are designed to work together, and the upper layers rely on the lower layers to provide the necessary functionality.
A layer may call other layers above and below it, as long as it uses them correctly. This is because the layers are designed to be interoperable, and the upper layers can use the services provided by the lower layers.
Therefore, all of the options are true with respect to layered architecture.