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The term that best describes the property ensuring that data cannot be altered undetectably is integrity. Integrity refers specifically to the accuracy and wholeness of data. When data maintains its integrity, it means that it remains unchanged and reliable throughout its lifecycle unless there is an authorized modification.

Ensuring integrity involves protections against unauthorized alterations and can include mechanisms such as checksums, hashes, and other verification methods that allow systems to detect any changes made to data. This is crucial in various contexts, such as financial transactions, medical records, and any scenario where accurate data representation is necessary. Maintaining integrity safeguards against errors, fraud, and other activities that could compromise the data's authenticity or reliability.

Confidentiality pertains to the protection of data from unauthorized access, ensuring that only those with proper permissions can view sensitive information. Availability refers to ensuring that authorized users have access to systems and data when needed, while authorization involves the processes that determine who is allowed to access or modify data. While all these concepts are essential for a comprehensive security strategy, integrity is the key property that specifically focuses on preventing undetectable alterations to data.