A backbone network is Group of answer choices a high speed central network that connects other networks in a distance spanning up to several miles. a group of personal computers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information. a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles). a network spanning a large geographical area (up to thousands of miles). a network spanning exactly 200 miles with common carrier circuits.

Which of the following is a difference between the systems development life cycle (sdlc) and extreme programming (xp)? the sdlc model has a separate planning and analysis phase, whereas xp combines both the phases into one phase.in the sdlc model, changes cannot be made to a system once it is delivered to the user, whereas the xp method delivers the system to the users and then make changes suggested by the user.the sdlc model develops an entire system at once, whereas xp uses incremental steps to improve an information system's qualitydevelopers following the sdlc model cannot go on to the next phase until the current phase is finished, whereas in xp, developers can move to any phase from the current phase.