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A factory is manufacturing cell phones that must each have a thickness of 0.5±0.001 inch. Which inequality describes the acceptable range of x, the thickness in inches of a cell phone?

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A factory is manufactuaring cell phones that must each have a thickness of 0.5+/-0.001 inch. Which inequality describes the acceptable range of x, the thickness in inches of a cell phone?

A. 0.499 ≤ x ≤ 0.501

B. x ≤ 0.49 or x ≥ 0.51

C. x ≤ 0.499 or x ≥ 0.501

D. 0.49 ≤ x ≤ 0.51

I believe it was C

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