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The horizontal approach to testing is advantageous because it focuses on evaluating the complete scope of a system or application across multiple functionalities and layers rather than in isolation. This approach allows for early insight into how different components of the solution interact and work together, which is crucial for identifying integration issues, ensuring that all parts are compatible, and assessing the overall functionality from the user's perspective. By looking at the solution’s full breadth early in the development cycle, teams can make more informed decisions, address potential problems sooner, and adapt their strategies as necessary.

This early insight can drive higher levels of quality and better alignment with user needs, fostering a more collaborative and responsive development environment. Other options may address important aspects of testing but do not capture the unique benefit of the horizontal approach in providing a comprehensive view of the project early on.