（）includes messages directed at retailers， wholesalers， and distributors， as well as industrial purchasers and professional such as lawyers and physicians.

（）includes messages directed at retailers， wholesalers， and distributors， as well as industrial purchasers and professional such as lawyers and physicians.
A.Public service advertising
B.Institutional advertising
C.Directional advertising
D.Business-to-business advertising
正确答案：Business-to-business advertising