Which of the following would best describe the difference between white-box testing and black-box testing? 

Answer options:

A. White-box testing is performed by an independent programmer team.
B. Black-box testing uses the bottom-up approach.
C. White-box testing examines the program internal logical structure.
D. Black-box testing involves the business units

C

Black-box testing observes the system external behavior, while white-box testing is a detailed exam of a logical path, checking the possible conditions. Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, chapter 6: Business Application System Development, Acquisition, Implementation and Maintenance (page 299).