Answer Description

The answer is MDM. Mobile device management allows access to company resources on an employee's personal device while providing administration of those resources and segregating access to them from the rest of the device. The other choices are just other ways to secure a mobile device

Wikipedia

Mobile device management (MDM) is the administration of mobile devices, such as smartphones, tablet computers, and laptops. MDM is usually implemented with the use of a third-party product that has management features for particular vendors of mobile devices. Though closely related to Enterprise Mobility Management and Unified Endpoint Management, MDM differs slightly from both: unlike MDM, EMM includes mobile information management, BYOD, mobile application management and mobile content management, whereas UEM provides device management for endpoints like desktops, printers, IoT devices, and wearables as well.