Which statements regarding Backlog Refinement are correct? (choose the 2 best answers)

Which statements regarding Backlog Refinement are correct? (choose the 2 best answers)
A . During Product Backlog refinement, items are reviewed and revised.
B. The Product Owner is responsible for organizing Backlog Refinement.
C. Backlog Refinement takes place before Sprint Planning.
D. No more than 10% of Scrum Team capacity is used for Refinement.
E. Product Backlog refinement is the act of adding detail, estimates, size, and order to items in the Product Backlog.

Answer: A,D

Explanation:

Scrum Guide:

Product Backlog refinement is the act of breaking down and further defining Product Backlog items into smaller more precise items. This is an ongoing activity to add details, such as a description, order, and size. Attributes often vary with the domain of work.