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The altering of data so that it is not usable unless the changes are undone is

  • A.biometrics
  • B.encryption
  • C.ergonomics
  • D.compression

Answer: B

Correct answer: encryption

Encryption transforms data by a reversible algorithm so that it is unreadable without the key, and readable again once the transformation is undone. Compression also alters data reversibly but its purpose is to reduce size, not to conceal; biometrics identifies people and ergonomics concerns workplace design.

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