What symbols represent the widget tree?

The correct answer, which is represented by the symbols "<>", signifies the structure of the widget tree in OutSystems. The widget tree is a hierarchical representation of the UI components and widgets that make up a screen or web application. The use of angle brackets is a common convention in web development, reflecting the nested nature of the components, similar to how HTML elements are structured. This notation helps developers visualize and navigate through the various UI elements, their relationships, and the way they are rendered on the page.

The other choices do not convey the same meaning as the angle brackets. For example, 'None' suggests there are no symbols to represent the widget tree, which is misleading since the structure indeed has a visual representation. The 'Gear' typically symbolizes settings or configuration tools, while 'Plug' is often used to represent connectivity or integrations, neither of which pertain to the visualization of the widget hierarchy in web development. Thus, "<>" accurately captures the essence of the widget tree in the context of OutSystems applications.