Which of the following activities occurs during the Inspect and Adapt workshop?

The Inspect and Adapt workshop is a significant event held at the end of each Program Increment (PI), where the current state of the Solution is demonstrated and evaluated by the train1. The first part of the workshop is the PI System Demo, which shows all the Features that the Agile Release Train (ART) has developed over the course of the PI2. The other options are not activities that occur during the Inspect and Adapt workshop. Refining the ART backlog is a continuous process that happens throughout the PI3. A retrospective of the Iteration is a team-level event that happens after every Iteration4. Planning the next PI is a separate event that happens before the start of the next PI.