Which of the following is NOT a method used by the U.S.government to avoid monetary counterfeiting?

Question

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Ridges in the paper that allow one to "feel" the amount of the bill with one's fingers are not a method used by the U.S. government to avoid monetary counterfeiting. While some denominations of U.S. currency do have ridges or raised printing to aid visually impaired individuals, this is not a security feature to prevent counterfeiting. The other options (A, C, D, and E) are all methods used by the U.S. government to prevent monetary counterfeiting.

Which of the Following Is NOT a Method Used by the U.S.government