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The appropriate choice for a rule that applies to a form to dynamically change form information on the form itself is a Client Script.

A Client Script runs on the user's browser and can manipulate the user interface and form data in real-time as the user interacts with the form. For instance, it can automatically set field values, show or hide fields, or even validate user input before the form is submitted. This dynamic capability enhances the user experience by allowing immediate feedback and updates without needing to refresh the entire page or submit the form.

In contrast, a Business Rule operates on the server side and is used to enforce data integrity, automate processes, and perform background operations. While Data Policies validate and enforce data standards, they do not modify form behavior directly within the user's interface in the way that Client Scripts do. UI Actions are typically used to create buttons or links that perform specific actions, but they do not inherently change form information or behavior dynamically without being triggered.

Thus, the best fit for dynamically changing form information right on the form itself is indeed a Client Script.