Question details:

Possible answers

a. internet cartilage b. internet nerve c.internet backbone d. internet artery

Answer:

The answer is d - The internet backbone.

"The Internet backbone refers to the main "trunk" connections of the Internet. It is made up of a large collection of interconnected commercial, government, academic and other high-capacity data routes and core routers that carry data across the countries, continents and oceans of the world." (Wikipedia)