ServiceNow Certified System Administration Practice

The correct answer is UI Policy. UI Policies in ServiceNow allow system administrators to enforce specific rules on form data, ensuring that users enter valid data according to defined conditions. These policies are client-side features that can show, hide, mandatory, or read-only fields based on specific criteria being met in real-time as the user interacts with the form. This capability ensures that data entered by users adheres to certain standards before submission, enhancing data integrity and user experience.

In contrast, Business Rules are designed to run on the server side and can manipulate data or enforce logic during various stages of database transactions but do not directly affect how forms are displayed or how users interact with fields. Client Scripts, while they also run on the client side and can impact forms, are more focused on executing JavaScript for functions such as calculating values or displaying alerts rather than enforcing validation rules on data entry directly. Access Control is another mechanism that governs user permissions and access rights within the system but does not specifically validate form data. Thus, the most appropriate and effective feature for enforcing rules on form data validation is indeed UI Policy.