To identify the total number of items stored in an organization, which section of the status dashboard or report should the ArcGIS Online administrator use?

The total number of items stored in an organization can be effectively gauged from the Content section of the status dashboard or report in ArcGIS Online. This section specifically provides insights into the items owned by the organization, such as maps, layers, and apps. By accessing this information, administrators can review the overall content storage and management effectively.

While the Items report does present a breakdown of different types of items, it is primarily used for more detailed analysis rather than simply stating the total count. The Members section focuses on user accounts and their roles, which doesn't pertain to item storage. The Activity report tracks interactions and usage metrics, rather than providing a count of stored items. Therefore, the Content section is the most direct and suitable choice for identifying the total number of items in an ArcGIS Online organization.