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the Product Owner is responsible for refining the Product Backlog, which is an ongoing activity that can occur at any time, including between Sprints.The other options are not typical activities for the Product Owner between Sprints, as the next Sprint starts immediately after the current Sprint1, the project plan is replaced by the Product Backlog2, and the Quality Assurance is done by the Developers of the Scrum Team within the Sprint1.

1:The Scrum Guide | Scrum.org2:What is a Product Backlog? | Scrum.org

According to the Scrum Guide, a Sprint can be canceled before the Sprint time-box is over. Only the Product Owner has the authority to cancel the Sprint, although he or she may do so under influence from the stakeholders, the Developers, or the Scrum Master. A Sprint would be canceled if the Sprint Goal becomes obsolete. This might occur if the company changes direction or if market or technology conditions change. In general, a Sprint should be canceled if it no longer makes sense given the circumstances. But, due to the short duration of Sprints, cancellation rarely makes sense. Developers cannot cancel a Sprint on their own, even if they face challenges or difficulties with the selected Product Backlog items, the functional expectations, the technical dependencies, or the Product Owner’s availability. Instead, they should collaborate with the Product Owner and the Scrum Master to find the best way to deliver value within the Sprint and adapt to the changing situation.

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The amount of the Sprint Backlog that must be defined during the Sprint Planning event is enough so the Developers can create their forecast of what work they can do. This is because:

Sprint Planning is an event where the Scrum Team plans for the upcoming Sprint. The purpose of Sprint Planning is to align the entire Scrum Team around a common goal and a plan for delivering an Increment that meets that goal.

The Developers are accountable for creating a Sprint forecast, which is a selection of Product Backlog items that they intend to work on during the Sprint. The Sprint forecast should be realistic, achievable, and valuable.

The Developers are also accountable for creating a plan for how they will deliver the selected Product Backlog items as a “Done” Increment. The plan may include tasks, dependencies, risks, estimates, or other information that helps them organize and manage their work.

The amount of the Sprint Backlog that must be defined during Sprint Planning may vary depending on the context, complexity, and uncertainty of the product development. However, it should be enough so that the Developers can create their forecast of what work they can do and have a clear direction for the first few days of the Sprint.

Other options, such as just enough to understand design and architectural implications, the entire Sprint Backlog being identified and estimated by the end of Sprint Planning, or just enough tasks for the Scrum Master to be confident in the Developers’ understanding of the Sprint, are not valid answers as they do not reflect what must be defined during Sprint Planning or what is required for creating a Sprint forecast.

The Developers are accountable for managing the progress of work during a Sprint, as they are the ones who plan, execute, and deliver the work. The Scrum Guide states that " The Developers are the people in the Scrum Team that are committed to creating any aspect of a usable Increment each Sprint. " 1 The Developers are also responsible for conducting the Daily Scrum, a 15-minute event for the Developers to synchronize activities and create a plan for the next 24 hours.1 The Developers are self-managing, which means they decide how best to accomplish their work, rather than being directed by others outside the Scrum Team.1

1: The Scrum Guide2, page 7

2: The Scrum Guide