A technician is deploying mobile devices and needs to prevent access to sensitive data if the devices are lost. Which of the following is the best way to prevent unauthorized access if the user is unaware that the phone is lost?

While a remote wipe can effectively erase all data on a device if it is lost, it requires that the technician be aware of the loss and have the necessary tools to initiate the wipe. If the user is unaware that the device is missing, the data could be vulnerable until the wipe is executed, leaving sensitive information exposed during that window of time.

Geofencing allows for the creation of virtual boundaries that can trigger alerts or actions when a device moves outside a designated area. However, this method does not protect the data itself; it primarily focuses on location-based security and may not prevent access if the device is lost outside of the predefined area.

Facial recognition provides a method of access control by requiring the user’s face to unlock the device. However, this only secures the device while it is in use. If the device is lost and the user is unaware, unauthorized individuals could bypass this security feature, gaining potential access to sensitive data.