Final answer:
The Development Team is responsible for ensuring that the Product Backlog items conform to the Definition of 'Done'. Stakeholders may provide input, and the Product Owner prioritizes the backlog, but the execution of work on backlog items is the duty of the Development Team.
Step-by-step explanation:
The student asked, "Who must do all the work to make sure Product Backlog items conform to the Definition of 'Done'?" The correct answer is C) Development Team. In the Scrum framework, it is the responsibility of the Development Team to ensure that each Backlog item meets the Definition of 'Done' before it is considered complete. The Definition of 'Done' is a shared understanding within the Scrum Team of what it means for work to be complete on the product increment.
Stakeholders, including customers, have a vested interest in the product being developed and can provide input into what needs to be done; however, they are not responsible for the actual completion of work on backlog items. The Product Owner manages the backlog, ensuring that it aligns with the project goals and stakeholder expectations. The Scrum Master facilitates the Scrum process and helps resolve obstacles, but neither role is directly responsible for executing the work on the backlog items. That responsibility lies solely with the Development Team.