Final answer:
The Development Team can change the definition of 'Done' at the end of each Sprint, usually during the Sprint Retrospective, to reflect lessons learned and improve processes.
Step-by-step explanation:
It is appropriate for a Development Team to change the definition of 'Done' at the end of each Sprint. The 'Definition of Done' is a shared understanding among the team members about what it means for work to be complete. The definition helps the team know when a Product Backlog item is finished and ensures transparency and quality in the deliverables. The team should usually revisit this definition at the end of a Sprint during the Sprint Retrospective when they inspect their process and look for ways to improve. This is the ideal time for the team to discuss any necessary changes to the definition based on the work they did during the Sprint, lessons learned, and potential improvements for quality and effectiveness going forward.