the first Sprint is the same as any other Sprint, and the Scrum Team should deliver a potentially releasable Increment of "Done" product at its conclusion. This means that the team should build at least one piece of valuable functionality that meets the Definition of Done and aligns with the Sprint Goal. The other options are not things that the Scrum Team should do during the first Sprint, as they are either too detailed, too vague, or too long-term for the Scrum framework. The Scrum Team should not make up a plan for the rest of the project, as Scrum is an empirical process that adapts to changing requirements and feedback1. The Scrum Team should not define the major product features and a release plan architecture, as these are the responsibilities of the Product Owner, who should have a vision and a roadmap for the product2. The Scrum Team should not analyze, describe, and document the requirements for the subsequent Sprints, as this would violate the principle of emergent design and just-in-time planning3.
1: The Scrum Guide | Scrum.org 2: What is a Product Owner? | Scrum.org 3: Emergent Design and Just-in-Time Planning | Scrum.org