Which of the following is considered a built-in validation?

In the context of OutSystems, built-in validation refers to the automatic checkups that are part of the platform to ensure data integrity and user input validation without requiring custom logic. The correct statement here is that there are indeed built-in validations in the OutSystems platform, often encompassing various types of validations that can be performed on user input.

While client-side checks, visual validations, and field formatting validations each serve important functions in data entry and user experience, they are typically considered specific approaches or techniques rather than the overarching concept of built-in validation that is present within the OutSystems framework itself. Built-in validation mechanisms ensure that inputs are not only suitable in format but also meet specific criteria determined by the application logic.

In summary, the answer stating "None of the above" emphasizes that while the other options represent common practices associated with validation, they are not defined as built-in validations in the OutSystems platform's context, and thus, it can be seen that there isn't a clear alignment with the definition of built-in validations as part of the framework. Understanding the specific role of built-in validations allows for better application design and user input handling.