A backbone network is:
a. a high speed central network that connects other networks in a distance spanning up to several miles.
b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.
c. a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles).
d. a network spanning a large geographical area (up to 1000s of miles).
e. a network spanning exactly 200 miles with common carrier circuits.
Answer: A