Which of the following statements is not correct regarding the polygraph?

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Which of the following statements is not correct regarding the polygraph?
A . The polygraph is not a lie detector.
B . The polygraph does not automatically register truth or falsehood.
C . A polygraph test is conclusive.
D . Historically, polygraphs have more often been used to establish innocence rather than to prove guilt.
E . None of the above.

Answer: C