What does the application verify during startup in relation to domain graph requirements?

During startup, the application verifies that all domain graph requirements are met to ensure that the system can function properly and that the necessary relationships and dependencies within the domain model are correctly configured. The domain graph is essential in representing the interactions and hierarchies between various entities in the application, and confirming that these requirements are satisfied guarantees that the application will operate as intended. This check helps avoid runtime errors and ensures data integrity, enabling smooth functionality of the domain model.

The other options, while they may be relevant aspects of the system's initialization process, focus on different areas. For instance, ensuring configuration files are in place is important for the application to find the necessary settings, but it does not directly pertain to the domain graph. The operational status of the server is crucial for overall system performance, but it does not specifically address the validity of the domain model. Similarly, user permissions are vital for security and access control, yet they are not part of the domain graph requirements verification process. Thus, meeting domain graph requirements is the focused check that directly contributes to the application's integrity and functionality.