WHAT_IS_TRUE_FOR_A_SYSTEM_TO_BE_PROPER_TESTABLE??$

1.	WHAT_IS_TRUE_FOR_A_SYSTEM_TO_BE_PROPER_TESTABLE??$
A.	It must be possible to control each components internal state and then observe its output
B.	It must be possible to control each components output and then observe its internal state
C.	it may or may not be possible to control each components internal state and then observe its output
D.	None of the mentioned
Answer» B. It must be possible to control each components output and then observe its internal state

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WHAT_IS_TRUE_FOR_A_SYSTEM_TO_BE_PROPER_TESTABLE??$

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