The -black box testing- methodology enforces which kind of restriction?

A. Only the external operation of a system is

accessible to the tester.

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

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

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

Black-box testing is a method of software testing that examines the functionality of an application without peering into its internal structures or workings.

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