Correct Answers: A, C, and D.

The Sprint Retrospective is an event where the Scrum Team reflects on how they worked together in the last Sprint and identifies ways to improve their collaboration, processes, and quality. Therefore, appropriate topics for discussion in a Sprint Retrospective are:

Team relations: The Scrum Team should discuss how they communicated, interacted, and supported each other during the Sprint. They should celebrate their successes, acknowledge their challenges, and address any conflicts or issues that arose. They should also share feedback, appreciation, and suggestions for improvement with each other.

How the Scrum Team does its work: The Scrum Team should inspect the methods, tools, and practices they used to deliver the product increment. They should evaluate what worked well and what could be improved. They should also identify any impediments, risks, or dependencies that affected their work and how they handled them.

Definition of Done: The Scrum Team should review their Definition of Done and check if it is still relevant, clear, and achievable. They should also assess how well they adhered to it and if they delivered a potentially releasable product increment that meets the quality standards. They should also consider if they need to update or adapt their Definition of Done based on new insights or feedback.

The following topics are not appropriate for discussion in a Sprint Retrospective:

The value of work currently represented in the Product Backlog: The value of the Product Backlog items is the responsibility of the Product Owner, who should continuously refine and order them based on stakeholder needs and feedback. The value of the Product Backlog items is not directly related to how the Scrum Team works together and does not affect their improvement actions for the next Sprint.

Arranging the Sprint Backlog for the next Sprint: The Sprint Backlog is the plan for the next Sprint that is created by the Scrum Team during the Sprint Planning event. The Sprint Backlog is based on the Product Backlog items that are selected for the next Sprint and how the Developers intend to accomplish them. The Sprint Retrospective is not a planning event but a reflection event that focuses on the past Sprint.

[Scrum Guide], section 3.5: “The purpose of the Sprint Retrospective is to plan ways to increase quality and effectiveness.”

[Professional Scrum Product Owner], chapter 7: “The Sprint Retrospective is an opportunity for the Scrum Team to inspect itself and create a plan for improvements to be enacted during the next Sprint.”

What is a Sprint Retrospective? | Scrum.org: “During each Sprint Retrospective, the Scrum Team plans ways to increase product quality by improving work processes or adapting the definition of “Done” if appropriate and not in conflict with product or organizational standards.”

The Sprint Retrospective - What It Is and Tips for Making the Most of Your Meeting: “The focus is on how the team worked together in the last sprint, including: Communication Teamwork Process Tools Systems Work environment Missing competencies Collaboration with external parties”