ServiceNow Certified System Administration Practice

To revert all unsaved changes made to a form, the most appropriate action is to cancel. When you choose this option, it effectively discards all modifications made since the last save, ensuring that the form returns to its original state prior to any changes. This action is particularly useful when you realize that the changes are not needed or are incorrect, preventing accidental data loss or errors in the workflow.

While other options might seem relevant, they do not fulfill the requirement as effectively. The option to save and close commits any changes made, which is not what is desired when looking to undo changes. The option labeled revert would imply a partial rollback but does not entirely cover the situation of discarding all changes. Lastly, "undo all" suggests a step-by-step reversal rather than a complete cancellation of changes before saving, making cancel the most suitable choice in this context.