Which of the Following Conditions Must Be Met to Effectively

Which of the following conditions must be met to effectively employ marketing public relations?

A) Marketing and public relations practitioners need to better understand how to use a variety of intermediaries to convey promotional messages.
B) Public relations agencies need to acquire firms specializing in other communication strategies.
C) All promotional elements need to be brought under control of the marketing department.
D) Practitioners of MPR need to have backgrounds in creative advertising.
E) Firms must establish a directly proportional link between promotion and sales.