The correct answer is Mobile Device Management (MDM) software because it allows the company to enforce security policies, remotely wipe corporate data, and manage devices uniformly without fully infringing on the personal use of the device. Antivirus software is important, but it is not as encompassing for a BYOD approach where control over the entire device is necessary. Biometric authentication increases security but does not protect corporate data if the device is lost or the employee leaves the company. Regularly updating apps is good practice but does not provide the granular control and security for corporate data that MDM software offers.