What feature allows you to ensure that certain fields are completed before a record can be submitted?

The correct answer is rooted in how data validation is enforced within ServiceNow. Data Policies are specifically designed to ensure that certain constraints, like field completion, are met when records are submitted. They function both on the server and client sides, ensuring that the rules are consistently applied regardless of how the record is being created or updated, whether through a form, an import, or an API.

With Data Policies, you can define which fields are mandatory, and if those fields are not filled in as required, the record will not be saved. This is particularly useful in maintaining data integrity and ensuring that critical information is collected before a record leaves the system.

While other features like UI Policies and Client Scripts can also manipulate field visibility and values, they do not have the same enforcement capability at the point of record submission. UI Actions generally control dynamic behaviors, such as taking an action when a button is clicked, but they do not dictate mandatory fields directly. Thus, Data Policies are the most appropriate tool for ensuring that key fields are completed before record submission.