What page type should you select to create an application tab template that displays agents' currently open cases only?

The correct choice for creating an application tab template that specifically displays agents' currently open cases is the entity list page type. An entity list is designed to show collections of records from a specific entity, enabling users to view multiple records at once. In the context of displaying currently open cases, it allows for filtering based on the status of those cases, ensuring that only the relevant records (in this case, open cases) are presented to the agents.

This choice also supports various functionalities, such as sorting and searching within the displayed records, providing agents with a streamlined method to access the cases they need to manage. The entity list can be set up to reflect real-time data, ensuring that agents see the most current information at a glance.

Other options like entity record, dashboard, and search, do not align with the requirement to display a specific list of records. An entity record would display the details of a single record rather than a collection, a dashboard provides an overview with various widgets and reports but not solely focused on displaying open cases, and search is typically for finding records rather than displaying a list of them. Thus, the entity list is the most suitable choice for this scenario.