What do you use to manually add a device to Apple Business Manager or Apple...

Apple Configurator is the tool for manually adding devices to ABM or ASM, especially for devices not purchased directly from Apple. TheApple Configurator User Guidestates, "Use Apple Configurator to add devices to Apple Business Manager or Apple School Manager by connecting them to a Mac via USB. This process supervises the devices and assigns them to your organization’s MDM server." Options A, B, and C serve other purposes and cannot perform this task.