Step 1: Classify networks by how far they reach.
Networks are usually grouped by their physical coverage area, ranging from just a few meters around a single person, up to an entire building, city, or even the whole globe.
Step 2: Place Bluetooth on that scale.
Bluetooth typically connects devices within about 10 meters of each other, such as a phone, a headset, or a smartwatch belonging to the same user.
Step 3: Compare against the other categories.
This range is far too small to count as a Local Area Network covering a building, a Virtual Private Network spanning the internet, or a Wide Area Network spanning cities, so it fits squarely into the smallest category.
\[ \boxed{\text{Personal Area Network}} \]