Which layer is responsible for handling orders and data that have been stored?

The Order Persistence Layer is the correct choice because it is specifically designed to manage the storage and retrieval of orders within the system. This layer ensures that all order-related data is not only stored efficiently but also that it can be accessed reliably when needed. It plays a crucial role in maintaining the integrity and consistency of order data, allowing for functionalities such as order tracking, updates, and retrieval after being stored.

In systems like Avaloq, the Order Persistence Layer abstracts the complexities involved with data storage, ensuring that interactions with order data are handled seamlessly. This layer interacts with databases and storage systems to provide a robust mechanism for persisting order information, enabling the application to function effectively and maintain a consistent order state across different operations.