What does a test plan describe?

A test plan serves as a comprehensive document that outlines the scope, approach, resources, and schedule of testing activities. It is a crucial component of the testing process within software development projects, particularly in Agile methodologies.

This document typically includes detailed descriptions of the objectives of testing, the components under test, and the testing methods to be utilized. It also delineates the resources required for testing, such as team members' roles and responsibilities, tools, and environments. Furthermore, a test plan defines the timeline for testing activities, helping to ensure that all team members are aligned and that testing is conducted in an efficient manner.

While other options touch on aspects of the testing process, they don't encapsulate the full breadth and purpose of a test plan. For instance, while tools and resources are part of what a test plan may include, they are not the entirety of it. Similarly, the organization of test execution activities and expected outcomes relate to specific implementations or results of testing rather than the overall framework that a test plan provides. Thus, the answer option highlighting the complete essence of a test plan's scope, approach, resources, and schedule stands out as the most accurate representation of this important document.