Which two activities are typical for a Product Owner during a Sprint?

The correct choice highlights the essential activities typical for a Product Owner during a Sprint, particularly involving collaboration and backlog refinement.

Working with the Development Team on backlog refinement is critical because it ensures that the product backlog remains well-organized and prioritized. By refining items in the backlog, the Product Owner helps clarify and detail requirements, which in turn aids the Development Team in understanding what to work on next, enhancing the efficiency and effectiveness of the Sprint.

Furthermore, stakeholder collaboration is another vital aspect of the Product Owner's role. Engaging with stakeholders allows the Product Owner to gather valuable feedback and insights, ensuring that the development process aligns with user needs and business goals. This ongoing communication is crucial for adjusting priorities and ensuring that the product evolves in a manner that maximizes value.

The other options do not encapsulate the full scope of the Product Owner's responsibilities during a Sprint. Conducting only retrospectives and planning would neglect the ongoing engagement and refinement needed throughout the Sprint. Focusing solely on user testing is a narrower responsibility that does not reflect the broader role of continuous collaboration and backlog management. Finally, managing administrative tasks only does not capture the strategic engagements and collaborative efforts that are fundamental to the effectiveness of the Product Owner within the Scrum framework.