OutSystems Reactive Web Developer Practice Test

The correct answer emphasizes the versatility of using Blocks within the OutSystems framework. Blocks are a key component in building reusable UI elements. They can be used inside Screens and other Blocks, which allows developers to create complex and modular designs efficiently. However, a Block cannot contain itself directly; this self-referential restriction promotes cleaner design and prevents potential infinite loops or recursive rendering scenarios that could arise from such a structure. Thus, while Blocks support reuse and nesting within various contexts, they maintain a constraint that prevents self-inclusion, ensuring that the application remains efficient and manageable.

The other options suggest limitations or allowances that don't accurately reflect how Blocks function in the OutSystems environment, leading to misunderstandings about their proper implementation. Understanding this scope is crucial for effective application development so that you can leverage Blocks to build organized, reusable components in your applications.