Which among these is NOT a type of MDM enrollment?

The option that is not a recognized type of Mobile Device Management (MDM) enrollment is hardware-based enrollment.

In MDM, there are several established enrollment methods that allow devices to be managed effectively within an organization. User-initiated enrollment is when users manually enroll their own devices into the MDM system, typically through a web portal or app. Automated enrollment refers to processes, such as the Device Enrollment Program (DEP), where devices are automatically enrolled in MDM as part of the setup process. Enrollment via Apple Configurator allows administrators to configure and manage devices by connecting them to a Mac with Apple Configurator installed, facilitating direct management of iOS and iPadOS devices.

While hardware-based enrollment might imply a physical aspect to the enrollment process, it is not a formalized method recognized in MDM frameworks. Rather, MDM enrollment methods focus on the means of connecting devices to management systems, which are more about software initiation and configurations rather than a hardware-centric process.