Select two ways in which Scrum uses time-boxing to promote self-organization? (Choose two.)

[answerhappygod]

Select two ways in which Scrum uses time-boxing to promote self-organization? (Choose two.)

A. Time-boxes ensures that the Development Team commits to completing the items in the Sprint Backlog by the end of the Sprint.
B. Time-boxes encourage the ones closest to the problem make the best possible decisions within the time-frame given the current situation.
C. Time-boxes can help teams plan how many additional Sprints is needed for User Acceptance testing.
D. Time-boxes helps everybody concentrate on the same problem at the same time.