A geofence is a virtual perimeter that sends notifications when a person goes outside of set regions, which is the fourth option.
A geofence is a virtual perimeter around a geographic area that determines when a person crosses the specified boundary and notifies the operator.
A geofence is typically enforced by monitoring the positions of trackable mobile devices inside or outside the area, and determining if they cross the "fence".
Therefore, it can be said that a geofence is a virtual perimeter that sends notifications when a person goes outside of set regions, which is the fourth option.
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