The correct answers are A and B. When multiple Scrum Teams work on the same product, Scrum calls for one Product Owner and one Product Backlog for that product. This ensures a single source of prioritization, clear accountability for maximizing value, and consistent product direction. One Product Owner helps avoid conflicting priorities across teams and provides one clear voice for product decisions.

One Product Backlog is equally important because it creates transparency for all work needed to develop the product. If each team had its own separate Product Backlog, the organization would risk fragmentation, duplicate work, inconsistent ordering, and confusion about the overall product direction. A single Product Backlog supports coordinated planning and alignment across all teams contributing to the same product.

Options C, D, and E are incorrect because they divide product accountability across multiple backlogs or multiple Product Owners. Scrum does not define a Chief Product Owner structure. For one product, there should be one Product Owner and one Product Backlog, even when multiple Scrum Teams are involved. This setup best supports focus, transparency, and value optimization.