What activities would a Product Owner typically undertake in the phase between the end of the current sprint and the start of the next sprint?

What activities would a Product Owner typically undertake in the phase between the end of the current sprint and the start of the next sprint?
A . Work with the QA departments on the increment of the current sprint
B. Update the project plan with stakeholders
C. Refine the backlog
D. There are no such activities. The next sprint starts immediately after the current sprint

Answer: D

Explanation:

There is no time in between sprints, so there cannot be activities.