What is meant by a mayor-council charter?

A. a gradual change in property ownership with wealthier people buying property and moving into neighborhoods, leading to the revitalization of the area
B. a city "constitution" that outlines the structure of city government, defines the authority of the various officials, and provides for their selection
C. a form of local government in which the city council hires a professional administrator to manage city affairs
D. the oldest and most common form of city government, consisting of either a weak mayor and a city council or a strong mayor elected by voters and council
E. a constitutional arrangement in which power is concentrated in a central government

D