What best describes an increment of working software?

An increment of working software is best described as additional features that are usable and complement previous work. In the context of Scrum, an increment represents the sum of all the completed product backlog items at the end of a sprint. This means that each increment should be fully functional and can be integrated with previous increments, enhancing the overall functionality of the product.

By focusing on the idea of additional features, the description emphasizes that each increment builds upon prior work, continually adding to the product's capabilities. This approach reflects the iterative nature of Scrum, where each sprint aims to produce a usable piece of software that stakeholders can review and test, leading to better feedback and adaptability based on real user needs.

In contrast, other options refer to different concepts that do not accurately reflect the nature of an increment. A minimal viable product suggests a narrow scope focused on market readiness rather than emphasizing ongoing improvement. A draft version implies incomplete work that lacks the quality and functionality expected in Scrum increments. Lastly, the final version ready for release refers to a product that has reached the end of its development cycle rather than the progression evident in incremental work achieved through Scrum.