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Duplicate data often results in loss of data integrity because:

  • A.the data formats may be inconsistent.
  • B.data values may not agree.
  • C.Both A & B.
  • D.Neither A & B.

Answer: C

Correct answer: Both A & B.

Duplication threatens integrity in two ways at once. The same fact may be recorded in different formats, so the copies cannot be compared reliably; and one copy may be updated while another is not, so they disagree outright. Removing the duplication removes both problems, which is the central argument for the database approach.

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