Think of a synonym of the word 'limit' or the word that refers to that thing around a building or between fields made of wood, wire... which prevents animals or people from going into that property.
The answer is 'FENCE'!!! Well, now think what an app called GEOFENCING may be used for. Here's a document that explains it: GEOFENCING
You can also watch this video:
and here's another one:
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SOLUTIONS to the exercises in the previous post: