Which of the following statements about the location features of different types of serviceindustries are true?

A、The business centers and offices performing the management function are located in the centers of cities.;
B、 The subsidiaries and departmental centers of enterprises are located in the sub-centers of cities.;
C、The finance, insurance, real estate industry are located in the centers of cities.;
D、There's no regular distinction among different types of services.