Which of the following security services, as defined by the ISO 7498-2 Security Architecture document, protects against active threats by verifying or maintaining the consistency of information?

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Which of the following security services, as defined by the ISO 7498-2 Security Architecture document, protects against active threats by verifying or maintaining the consistency of information?
A . Data confidentiality
B . Authentication
C . Non-repudiation
D . Data integrity

Answer: D