Integrity in information security refers to:

Integrity in information security is primarily concerned with ensuring that data remains accurate, consistent, and unaltered without proper authorization. This means that any modifications to the data can only be made by individuals who have the appropriate permissions, thereby preserving the original state of the information.

When integrity is maintained, users can trust that the data they are working with is reliable and has not been tampered with, which is critical in various contexts, such as financial records, health information, and other sensitive data. Therefore, the correct definition of integrity aligns with the concept of protecting data from unauthorized changes, ensuring its authenticity over time.

The other choices describe different aspects of information security. Having access to information at any time pertains to availability, while the secure sharing of information relates to confidentiality and the protection of data during transmission. Confidentiality, on the other hand, focuses on restricting access to data rather than ensuring its integrity.