Per Agile (scrum methodology), what is the definition of a BACKLOG?

A. It is a prioritized list of desired products or product features/capabilities developed from user stories. Backlogs typically exist at two levels of detail: product and sprint. Many organizations also maintain a backlog at a higher portfolio level

B. It includes the "activities of writing and refining, estimating, and prioritizing product backlog items"

C. It is: (1) a combination of features when packaged together, forms a coherent user deliverable or (2) a product version promoted for use or deployment

D. It is a short duration development cycle, typically between a week and a month, during which the agile team is focused on producing a potentially shippable product increment that meets the team's definition of done