Where is a validate rule typically referenced?

A validate rule is typically referenced in a flow action. Flow actions are used in Pega applications to define the actions that will be executed when a user interacts with a user interface. When a flow action requires user input, such as information being entered through a form, the validate rule is invoked to ensure that the data entered meets specific criteria before proceeding to the next step in the process. This validation helps maintain data integrity and ensures that users provide acceptable and accurate data as part of the workflow.

In contrast, the other options involve different aspects of the application's design. Screen flows are broader constructs that define the navigation and user experience but are not specific to data validation. User input sections refer to areas within a user interface where users can enter information, but they do not specifically manage the rules for validating that input. Data pages primarily focus on data retrieval and storage, rather than validation of user input. Therefore, referencing a validate rule in a flow action is crucial for ensuring compliance with the necessary data requirements during user interactions.