According to SAFe, the Iteration Retrospective is a key event that enables relentless improvement, one of the pillars of the SAFe House of Lean. The purpose is to reflect on the previous iteration and identify what went well, what didn't, and what can be improved.
An essential outcome of this meeting is a set of actionable improvement items that can be added to the team backlog. These items are often captured as improvement Stories, ensuring that process enhancements are visible, prioritized, and implemented in the next iteration.
From SAFe guidance:
"The retrospective concludes with actionable improvement items added to the backlog. These items should be implemented in subsequent iterations to improve performance." Therefore, the correct answer is D. Ensure the event ends with actionable improvement items for the backlog, as it ensures continuous learning and measurable improvement.