What step must an ArcGIS Online administrator take to transfer group ownership from one member to another?

To transfer group ownership in ArcGIS Online, the administrator must select the specific group and then assign a new owner. This process is designed to ensure that the designated individual is granted the responsibilities and privileges associated with group management, which include modifying group settings, adding or removing members, and controlling shared content.

Assigning a new owner is a formal and direct method of transferring control, avoiding potential confusion that could arise from either sharing the group with someone else or attempting to create a duplicate group for the new owner. Unlike simply sharing the group, which does not change the owner and only provides access, or creating a copy that essentially starts a new group rather than transferring existing content and management responsibility, this method effectively maintains continuity and allows for a streamlined transition of ownership.

Thus, selecting the group and assigning a new owner is the most straightforward way to ensure that group authority is properly vested in the new individual, aligning with the administrative protocols of ArcGIS Online.