What are the two main categories of PCF elements at the top level?

The two main categories of PCF (Page Configuration File) elements at the top level are widgets and locations. Widgets are the building blocks of the user interface in Guidewire applications, providing interactive components that allow users to display and manipulate data. They can include elements like buttons, input fields, and panels, which facilitate user interactions.

Locations, on the other hand, define the structure of a page or a section within a page. They serve as containers for widgets, determining where they are displayed and how they are organized on the interface. Locations help in navigating between different parts of the application and orchestrating the layout.

This structured approach of using widgets for interaction and locations for layout is fundamental to Guidewire's UI development, enabling developers to create cohesive and user-friendly interfaces. Other options, while they may contain relevant components or concepts, do not accurately capture the primary top-level categories of PCF elements in the familiar context of Guidewire development.