Sara, a security administrator, manually hashes all network device configuration files daily and compares them to the previous days' hashes. Which of the following security concepts is Sara using?

Confidentiality is about preventing unauthorized disclosure of data, not detecting whether data has been modified.

Compliance refers to adherence to regulations and policies; while hashing may support compliance, the specific action described is an integrity control.

Integrity ensures that data has not been altered in an unauthorized manner. By hashing configuration files and comparing daily hashes, Sara can detect any modification - whether from an attacker, misconfiguration, or unauthorized change - because even a single-bit change produces a completely different hash value. This is a direct implementation of the integrity principle from the CIA triad.

Availability ensures systems and data are accessible when needed, which is unrelated to comparing file hashes.