Which zoom option is not available in Revit?

In Revit, the zoom options are designed to allow users to navigate their models effectively. The correct choice indicates that "Zoom out by 3 times" is not a predefined zoom option within the software.

Revit provides several zoom functionalities, including "Zoom to Fit," which allows users to view the entire model within the current window, and "Zoom Region," which enables users to specify a particular area they want to focus on. Additionally, "Zoom In" is available, allowing users to get a closer look at details within the model. However, the concept of zooming out by a specific increment like "3 times" is not a standard feature in Revit's zoom tools; instead, users can zoom in or out incrementally or use specific commands to adjust their viewpoint. This discrepancy highlights that while flexibility in zooming is provided, fixed ratios for zooming out do not exist within the software's functionality.