Final answer:
The 'Actual start' field on a change request is populated when the State changes to 'Implement', while the 'Actual end' field is set when the State changes to 'Closed', signifying the commencement and completion of the change process respectively.
Step-by-step explanation:
The question concerns the fields on a change request within an IT Service Management (ITSM) tool, such as ServiceNow. The Actual start and Actual end date fields are typically used to track when work on a change request actually began and ended, which is essential for managing and reporting on change processes.
The Actual start is set when the State changes to Implement. This signifies that the implementation of the change has commenced. The Actual end is set when the State changes to Closed. This indicates that the change has been fully implemented and all tasks associated with the change have been completed, and it is now officially considered closed. Therefore, option C reflects the correct scenario for populating the Actual start and Actual end date fields on a change request.