-------- hierarchically divides the application into testing units, or subjects.
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Test lab Tree
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Test Requirements
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Test plan Tree
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Test hierarchy
C
Correct answer
Explanation
The Test Plan Tree in Quality Center hierarchically organizes all tests into folders and subfolders based on application structure, functional areas, or testing units. This tree structure allows teams to group related tests together (by subject area or feature) and maintain an organized, scalable test repository. The Test Lab focuses on execution sets rather than hierarchical organization.