Which data format can be successfully added as an item to ArcGIS Online?

The option indicating that a shapefile in a zipped folder can be successfully added as an item to ArcGIS Online is correct because ArcGIS Online supports the addition of shapefiles when they are compressed into a single .zip file. This zipped folder can contain the necessary components of a shapefile, such as .shp, .shx, .dbf, and any other associated files (.prj, etc.) that are crucial for the shapefile to function correctly. When uploaded in this format, ArcGIS Online can interpret the data structure and allow users to visualize, share, and perform analysis on the shapefile data.

In contrast, while the other listed formats may be used within various ESRI platforms, they do not have the same compatibility with ArcGIS Online. A file geodatabase is not directly supported for upload to ArcGIS Online as a single item. An XML workspace document generally serves specific purposes in data management and is not designed for direct upload to ArcGIS Online. A geometric network, which represents a complex structure of interconnected features, is also not a format acceptable for direct addition to ArcGIS Online. Each of these formats has a distinct role but does not align with the requirements for uploading and sharing data through ArcGIS Online like