The "Gray-box testing" methodology enforces what kind of restriction?

The "Gray-box testing" methodology enforces what kind of restriction?
A . Only the internal operation of a system is known to the tester.
B . The internal operation of a system is completely known to the tester.
C . The internal operation of a system is only partly accessible to the tester
D . Only the external operation of a system is accessible to the tester.

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Answer: C