Which of the following is a restriction being enforced in “white box testing?”

Which of the following is a restriction being enforced in “white box testing?”
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: B