Which network is a packet switching network?

Answer: Option D

* A network is a way for computers to connect and share information.
* Packet switching is a method of breaking down data into small pieces called packets before sending them across the network.
These packets are then reassembled at the destination. It's like sending a book page by page instead of the entire book at once. This makes the network more efficient.

Now let's look at the options:

* Ring network, Star network and LAN (Local Area Network) : These describe how computers are connected, but don't inherently tell us if they use packet switching.
* EuroNET: EuroNET was specifically designed as a packet-switching network.
* None of the above: This would only be correct if none of the other options used packet switching.

Therefore, the correct answer is EuroNET because it was designed to use packet switching.