Final answer:
The correct topics for a Sprint Retrospective discussion are Daily Scrum effectiveness and Team collaboration, as they are related to improving the team's work process for future sprints.
Step-by-step explanation:
During a Sprint Retrospective, team members reflect on the past sprint to improve processes and teamwork for future sprints. The appropriate topics for discussion in a Sprint Retrospective would be a) Daily Scrum effectiveness and c) Team collaboration. These topics are directly related to the team's work process and how they can improve it for the next sprint. Product backlog priorities and product release schedules are typically discussed in the Sprint Planning and Sprint Review meetings respectively and are not the focus of the Sprint Retrospective.