Questions of Interest …..

• If D is faulty, will its incorrectness alter the behavior of the system and if so, how?

• If D is correct, but the interface between D and A is faulty, will that affect the system?

• If D is correct, but the interface between D and B is faulty, will that affect the system?

• Might D exacerbate problems in A or B that have so far not affected the system?

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