Which of the following is a secondary container widget?

The correct choice is List Detail View, which serves as a secondary container widget in the context of Guidewire applications. A secondary container widget is typically used to display additional information related to a primary container, allowing for a more organized and structured presentation of data.

The List Detail View is designed to present a list of items along with detailed information about a selected item in a cohesive manner. This combination helps to group related data together and provides users with an intuitive way to navigate between summary and more detailed information. It effectively enhances the user interface by ensuring that users can view a comprehensive set of details based on their selection without navigating away from the main screen.

The other options, while important in the Guidewire framework, do not fulfill the same role as a secondary container. For instance, Detail View typically serves as a primary container that focuses on showing detailed data for a single record, rather than grouping multiple pieces of information. Screen Container functions as a broader structural element for organizing various widgets within a single screen, and Input Set is primarily used to handle user input fields rather than serving as a container for presenting lists and details together. Therefore, the List Detail View uniquely fits the definition of a secondary container widget.