Which of the following best explains the role of a city under central place theory?(1 point)
1 A city serves a function beyond its immediate area by performing services integral to the world economy.
2 A city exists above a threshold and under a range of economic production as it provides for its surrounding market area.
3 A city provides for a specific ranking of different central places depending on their size.
4 A city marks the minimum provision needed for a central place to be economically reasonable in a given area.