The correct option is Prevention of modification of data by authorized users.

Prevention of modification of data by authorized users is not one of the Clark Wilson integrity objectives because the model is designed to allow authorized subjects to change data only through controlled and certified mechanisms. The model enforces integrity by requiring well formed transactions and separation of duties so that authorized users can perform legitimate updates while still preserving integrity.

Prevention of modification of data by unauthorized users is an integrity objective because Clark Wilson requires that only authorized subjects be able to initiate certified transformation procedures that modify data.

Prevention of unauthorized or inadvertent modification of data by authorized users is also an integrity objective because the model addresses both malicious and accidental corruption by imposing certified procedures, auditing, and separation of duties to limit what authorized users can do and to detect improper changes.

Preservation of internal and external consistency is part of the Clark Wilson objectives because the model requires that system state remain consistent with business rules and that internal consistency is verifiable against external records or constraints.

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