ServiceNow Certified System Administration Practice

The correct answer is UI Policies. UI Policies are used to change the behavior of fields on a form dynamically based on certain conditions. They operate on the client side, meaning they execute within the user's browser rather than on the server. This allows for real-time updates to the user interface without needing to refresh the entire page, such as making fields mandatory or read-only based on user choices or other criteria.

In contrast, Business Rules operate on the server side and execute when a record is created, updated, or deleted. Data Policies also run primarily on the server, though they can enforce data integrity rules on the client as well, but they do not directly manipulate the UI. Script Includes are server-side scripts that encapsulate reusable code and cannot manipulate the client interface directly. Hence, UI Policies are uniquely positioned to provide immediate feedback and changes in response to user interactions on forms.