What statement is true about Screen Containers?

A Screen Container is specifically designed to hold various components and widgets that make up a user interface in the Guidewire platform. The correct statement highlights that a PanelRef widget can indeed reference a reusable Detail View within a Screen Container. This allows developers to modularize their UI components effectively, promoting reusability and consistency across different screens.

When a PanelRef is used within a Screen Container, it can point to a Detail View that encapsulates specific functionality or information about an entity. This modular approach enhances code maintainability and facilitates a clean development process by allowing developers to reuse existing components rather than creating new ones from scratch.

The other choices point out limitations or misconceptions about Screen Containers. For example, they are indeed capable of holding nested components, contrary to what is suggested in the second option. Moreover, they are not restricted to List Views; they can be utilized across various types of views within the application, including Detail and Edit views. Lastly, while layout definitions can enhance organization within Screen Containers, it's not a requirement for their functionality, meaning that they can function without these definitions. This flexibility is a crucial advantage of using Screen Containers in Guidewire.