Which of the following is/are role(s) of a Chief Scrum Master, not of a Chief Product Owner?

A) Addresses impediments that impact more than one Scrum Team.

B) Prepares and maintains the overall Prioritized Product Backlog for the large project.

C) Facilitates the Scrum of Scrums meetings.

D) Interfaces with the Program Product Owner to ensure alignment of the large project with the goals and

objectives of the Program.