Final answer:
In agile software development, the team decides whether a user story is delivered, while the product owner or customer decides whether it is accepted.
Step-by-step explanation:
In agile software development, the team collectively decides whether a user story is delivered. Delivery is typically determined through a set of agreed-upon acceptance criteria that must be met. Once a user story is delivered, it is then up to the product owner or customer to decide whether to accept or reject it based on whether it meets their expectations and requirements.