The -gray box testing- methodology enforces what kind of restriction?

A. The internal operation of a system is only partly accessible to the tester.

B. The internal operation of a system is completely known t

o the tester.

C. Only the external operation of a system is accessible to the tester.

D. Only the internal operation of a system is known to the tester.

A black-box tester is unaware of the internal structure of the application to be tested, whi

le a white-box tester has access to the internal structure of the application. A gray-box tester partially knows the internal structure, which includes access to the documentation of internal data structures as well as the algorithms used.

References: