Which option is NOT available when exporting to a collaborator?

Exporting data to a collaborator in Cvent typically allows users to share specific details aimed at facilitating collaboration and decision-making regarding an event's layout and logistics. The options provided generally correspond to different aspects of data that can be shared.

The choice relating to the "entire event timeline" is not available because Cvent focuses on providing specific and actionable items that can be utilized in planning and diagramming. The current room, all rooms, and selected areas are all pertinent elements that someone involved in event planning would need to access in order to make informed choices about layout and configurations. The event timeline, however, involves a broader scope that extends beyond the immediate physical space or diagramming context, emphasizing planning rather than the specifics of layout.

Thus, the reason the entire event timeline is not an option for export to a collaborator is that it does not align with the immediate needs of diagramming and room selection, which are the primary focus of collaborating on event layouts.