A is correct because prioritizing backlog user stories by business priority is one of the responsibilities of the product owner in release and sprint planning. The product owner decides which user stories are more important and valuable for the customer and orders them accordingly in the product backlog.
B is correct because defining objectives for each release is one of the responsibilities of the product owner in release and sprint planning. The product owner sets the goals and expectations for each release, based on the customer's vision and feedback, and communicates them to the project team and stakeholders. Verified :