A backbone network is $\_\_\_\_\_\_\_\_\_\_.$

Group of answer choices

a group of personal computers or terminals located in the same general area and connected by a common cable $($communication circuit$)$

a network spanning a geographical area that usually encompasses a city or county area $(3$ to $30$ miles$).$

an invisible network infrastructure spanning a static geographical area

a network spanning exactly $200$ miles with common carrier circuits

a high speed central network that connects other networks in a distance which may span up to several miles.