Which two of the following are appropriate topics for discussion during a Sprint Retrospective?

According to the Scrum Guide1, the purpose of the Sprint Retrospective is to plan ways to increase quality and effectiveness. The Scrum Team inspects how the last Sprint went with regards to individuals, interactions, processes, tools, and their Definition of Done. Inspected elements often vary with domain, practices, and people involved. The Scrum Team identifies the most helpful changes to improve its effectiveness. The most impactful improvements are addressed as soon as possible. They may even be added to the Sprint Backlog for the next Sprint. Therefore, two appropriate topics for discussion during a Sprint Retrospective are:

Identifying high priority process improvements for the next Sprint.

How the team collaborates.

The other options are not relevant or appropriate for the Sprint Retrospective.

References: Scrum Guide