Which of the following statements is incorrect (A) \( x \operatorname{sgn} x=|x| \) (B) \( |x| \...

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Which of the following statements is incorrect
(A) \( x \operatorname{sgn} x=|x| \)
(B) \( |x| \operatorname{sgn} x=x \)
(C) \( x(\operatorname{sgn} x)(\operatorname{sgn} x)=x \)
(D) \( |x|(\operatorname{sgn} x)^{3}=|x| \)
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