The Nexus Sprint Retrospective is an event that occurs at the end of the Sprint where the Nexus, which is a group of approximately three to nine Scrum Teams working on the same product, plans ways to increase quality and effectiveness across the whole Nexus 11. The purpose of the Nexus Sprint Retrospective is to inspect and adapt the Nexus framework, the integrated work, the processes, the tools, and the interactions among the Scrum Teams 11. Therefore, statement C is correct.

The Nexus Sprint Retrospective follows a three-step process: first, representatives from each Scrum Team identify issues that affect multiple teams; second, each Scrum Team conducts its own Sprint Retrospective; and third, representatives from each team meet again to discuss any actions needed based on the shared challenges 112233. The Nexus Sprint Retrospective enables bottom-up intelligence to improve how the Scrum Teams in a Nexus are working together, as it allows the teams to share their insights, learn from each other, and collaborate on solutions 44. Therefore, statement A is also correct.

Statement B is incorrect because the Nexus Sprint Retrospective is not a forum for management to see how the Nexus is performing, but rather a time for the Nexus to self-organize and self-improve 1144. Statement D is incorrect because the Nexus Sprint Retrospective is not a single meeting to inspect and adapt how all Scrum Teams work together, but rather a combination of three meetings that involve both individual and collective reflection and action 112233.