Which of the following best describes Site Properties in OutSystems?

Site Properties in OutSystems are designed specifically for configuration purposes, giving developers the flexibility to adjust settings without necessitating a code deployment. This aspect is crucial for scenarios where customizations or environment-specific configurations are required, such as toggling features on or off or changing external service URLs. By allowing changes to be made directly within the OutSystems environment after the application is already deployed, Site Properties help streamline the development cycle and enhance the maintenance process.

The incorrect answers focus on other aspects that are not applicable to how Site Properties function. For instance, not all constants are immutable in the context of Site Properties; they can be modified. Furthermore, defining properties only during runtime contradicts their primary use; they are usually defined at design-time but can be modified later. Lastly, while Site Properties may often interact with UI components, they do not need to be directly linked to them, as their configuration role is independent of UI specifics.