Which option denotes a collaborative feature in Revit?

The collaborative feature in Revit is linking. This functionality allows multiple users to work on different aspects of a project simultaneously while maintaining a coordinated and consistent model. When a Revit model is linked, it references another Revit file, which means changes made in one file can be automatically updated in the linked model. This not only enhances teamwork but also reduces errors that can occur when multiple files are being managed separately.

In contrast, importing, exporting, and dimensioning do not inherently facilitate collaboration among different users or different Revit files. Importing allows users to bring outside files into Revit, exporting permits users to send Revit data to different formats, and dimensioning focuses on annotating elements within a single project. These functions support the design process but do not promote the integrated teamwork that linking does.