How much work must a Development Team do to a Product Backlog item it selects for a Sprint?
(choose the best answer)
A proportional amount of time on analysis, design, programming, testing, and documentation.
As much as it has told the Product Owner will be done for every Product Backlog item it selects in conformance with the definition of "Done".
All development work and at least some testing.
As much as it can fit into the Sprint. Any remaining work will be transferred to a subsequent Sprint.