If Product Backlog refinement is needed, when is the ideal time for refinement to take place and who should participate? (choose the best two answers)

If Product Backlog refinement is needed, when is the ideal time for refinement to take place and who should participate? (choose the best two answers)
A . The Product Owner must do this as essential work in Sprint O.
B . The Scrum Team on an ongoing basis, defining Product Backlog items into smaller more precise items that are ready for selection.
C . The Product Owner takes the time between the end of one Sprint and the start of the next Sprint to complete refinement.
D . Business analysts in the organization should do this work for the Scrum Team 1-2 Sprints ahead of the development Sprints.
E . The Scrum Team during the current Sprint, if they have been unable during preceding Sprints to define Product Backlog items with enough precision to begin work.

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Answer: B, E