Which of the following statements is LEAST likely to be true of non-functional testing?
A. It covers the evaluation of the interaction of various specified components.
B. It tests "how" the system works.
C. It may include testing the ease of modification of systems.
D. It may be performed at unit, integration, system and acceptance test levels.
A. It covers the evaluation of the interaction of various specified components. This seems to be a description of integration testing, which is part of functional testing.