A. Bring the Development Team members together and interpret the Definition of Done for them so that there are no future conflicts on interpretation.

B. Immediately end the discussion before it becomes worse. Make the decision on what work is needed to make the item 'done' and teach the team about the importance of avoiding conflicts.

C. Facilitate a session with all members on the Scrum Team to help them resolve the conflict, refine the Definition of Done, and become effective again. Tell the team that conflicts are a natural occurrence and coach them on the value of resolving conflicts.

D. Bring the Product Owner to the discussion and have him/her decide the work needed to make the item 'done.' It is the Product Owner's responsibility to manage the Development Team members.