What action should an ArcGIS user take to make an existing file geodatabase feature class available in another file geodatabase?

The most appropriate action an ArcGIS user should take to make an existing file geodatabase feature class available in another file geodatabase is to copy or export the feature class from the original geodatabase and then paste or import it into the destination geodatabase. This process involves utilizing the functionality within ArcGIS to ensure that the feature class is effectively transferred.

By creating a new feature class in the destination file geodatabase, one typically starts from a capabilities perspective where fields, types, and data characteristics must be defined. However, this approach is not the most efficient for transferring an existing dataset, as it does not facilitate the direct transfer of data from the source to the destination.

The action of copying and pasting ensures that all the attributes, geometry, and associated rules of the original feature class are maintained within the new environment. This method allows users to efficiently manage their datasets and uphold data integrity across different geodatabases.

Proper use of the copy and paste functionality or exporting/importing can significantly streamline workflows, especially when working with complex datasets that have important spatial relationships and attribute information.