Which functionality allows OAC users to revisit previous versions of reports?

Version Control is the functionality that enables OAC users to revisit previous versions of reports. It allows users to manage the changes in report documents over time. By using version control, users can save multiple iterations of a report, enabling them to access, compare, and restore earlier versions if necessary. This is particularly useful for collaborative environments where reports may undergo numerous revisions, ensuring that important work isn't lost and providing the flexibility to revert to previous data states.

The other options do not provide the same capability. For instance, Query History relates to tracking the queries that have been run but does not manage versions of the report itself. Report Authentication involves verifying user identity and permissions, which is unrelated to tracking or managing versions of reports. Access Levels pertain to the permissions granted to users for accessing different types of content within OAC, rather than focusing on versioning functionality. Thus, Version Control clearly stands out as the correct choice for revisiting previous versions of reports.