Which of the following statements are true about the Scrum Master role?

[answerhappygod]

Which of the following statements are true about the Scrum Master role?

A. The Scrum Master assigns the tasks to Development Team members and ensures they are completed within the committed timebox.
B. The Scrum Master helps those outside the Scrum Team understand which interactions are helpful and teaches the Development Team to keep the Scrum meetings within the timebox.
C. The Scrum Master is responsible for updating the Scrum board and ensuring team members avoid conflicts.
D. At the Sprint Review, the Scrum Master demonstrates the completed Increment and answers any questions from the stakeholders.