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__________ states that only valid data will be written to the database.

  • A.Consistency
  • B.Atomicity
  • C.Durability
  • D.Isolation

Answer: A

Correct answer: Consistency

Consistency requires that a transaction take the database from one valid state to another, preserving every integrity constraint - keys, referential integrity, and application rules such as an account balance never going negative. A transaction that would violate one is aborted.

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