Question

what aspect of the internet makes it fault - tolerant?
email servers
web servers
fiber - optic cable
mesh design

Explanation:

The mesh design of the internet allows for multiple paths for data to travel. If one connection fails, data can be rerouted through other available connections, making it fault - tolerant. Email servers, web servers, and fiber - optic cables are important components of the internet but do not directly contribute to its fault - tolerance as the mesh design does.

Answer:

mesh design