Final answer:
Integrity is the aspect of the CIA triad that ensures the accuracy and reliability of data throughout its lifecycle.
Step-by-step explanation:
The part of the C-I-A (Confidentiality, Integrity, Availability) triad that refers to maintaining and assuring the accuracy of data over its life-cycle is b) Integrity. Integrity ensures that the data is reliable and accurate throughout its lifecycle, which means it has not been tampered with or altered by unauthorized individuals. This is critical for functions that rely on correct and untainted information, such as financial transactions, health records, and legal data.