Which three questions should you ask?

You are a scrum master.
You need to lead the daily scrum meeting.
Which three questions should you ask? (Each correct answer presents part of the solution. Choose three.)
A. What will be done before the next meeting?
B. What went well?
C. What has been accomplished since the last meeting?
D. Are there any potential improvements?
E. What obstacles are in the way?
F. Is the burndown up to date?