Which two actions can only be performed by an ArcGIS Online administrator?

The ability to review credit status is a function that is designated specifically for ArcGIS Online administrators. Administrators have access to account management features that allow them to monitor the usage of credits, which are necessary for various services and operations within ArcGIS Online. This oversight is vital for managing the organization's budget and ensuring that the use of resources remains within set limits.

While other actions like publishing and updating content can often be performed by members with appropriate roles (like editors or contributors), reviewing credit status is limited to administrators. Similarly, adding or inviting members is typically also a function reserved for those with administrative privileges, as it involves managing the overall structure and membership of the organization. Only administrators have the necessary permissions to view and handle financial aspects like credit usage effectively, which is why the selection regarding credit status is the correct answer.