Discussion
What is known as 'Invisible road' ?
Answer: D
The key gives the Internet as the 'Invisible road'.
The phrase uses the road as an image of a path along which things travel: the Internet carries information, goods and money for its users, but there is nothing physical to see. It is a common way in popular writing to describe a network that moves data the way a road moves traffic.
Telecom is the wider industry of telephone and radio networks, a computer is a device and not a route, and WiFi is only a wireless way of reaching a network. None of them is the network that connects the world.
I could not find 'Invisible road' as a defined term in a standard reference, so the answer rests on this reading and on elimination; it is the official key's answer.
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