What defines a test level?

A test level is defined as a group of organized test activities that occur in a distinct segment of the software development lifecycle. Each test level corresponds to a specific stage of testing, such as unit testing, integration testing, system testing, or acceptance testing, and it focuses on different testing objectives and targets. Understanding test levels helps in structuring the testing process effectively, ensuring that all aspects of the system are evaluated according to their specific requirements and risk profiles.

The other options, while related to testing, do not define a test level directly. A collection of test resources refers to the tools, environments, or personnel needed for testing, which are essential but not the defining feature of test levels. Strategies for test execution pertain to how testing activities will be carried out but do not encompass the concept of test levels themselves. Finally, procedures for following up on test results focus on the outcomes and metrics gathered from testing, rather than the organization of the testing activities within different levels of the testing process.