The four test levels defined for the common V-model testing approach include which of the following?

The correct answer identifies the four test levels in the V-model testing approach, which are component, integration, system, and acceptance testing. Each level has distinct objectives and focuses on different aspects of the software development process.

Component testing is the first level, where individual parts of the software (components) are tested in isolation to ensure that each piece functions correctly and interacts properly with other components. This level usually includes unit tests, where the smallest testable parts of the software are tested.

Integration testing follows, where the interaction between integrated components is evaluated. This confirms that combined units interact as expected and that the overall functionality is intact.

System testing then assesses the complete and integrated software product to ensure it meets the specified requirements and works under expected workloads and conditions. This is often performed in a testing environment that closely resembles production.

Finally, acceptance testing verifies the system’s readiness for deployment from the user's perspective. This level checks if the software meets business needs and is acceptable for delivery to end-users.

Understanding these levels is crucial for effectively applying the V-model in software testing, as each test level corresponds to specific activities in the development lifecycle and contributes to overall product quality.