Which statement about screen aggregates is false?

Screen aggregates play a central role in the OutSystems environment, particularly regarding their behavior in application screens. The statement that screen aggregates can only fetch data from the database is misleading because screen aggregates can also be constructed to retrieve data from other sources, such as external APIs or in-memory data structures, not strictly confined to database queries.

In the context of OutSystems development, screen aggregates are designed to facilitate data management within a specific screen. They can handle different data sources depending on the requirements of the application and are versatile in data retrieval methods, including but not limited to database operations. Thus, the assertion that they are limited to database data fetching is inaccurate, making it the false statement among the options presented.

Other statements regarding screen aggregates provide accurate representations of their behaviors. For instance, aggregates operate within the scope of the defined screen, reflecting their contextual functionality. Additionally, the execution model of screen aggregates emphasizes that they can run asynchronously and in parallel, enhancing performance and user experience in applications. The option regarding explicit execution aligns with how aggregates are designed to be invoked within the context of their usage, further clarifying their operational parameters.