Which of the Following Statements Is True About Agency Commissions

Which of the following statements is true about agency commissions?

A) The negotiated commission system is increasingly replacing the traditional commission system.
B) Agencies are increasingly relying on mass media for their income.
C) Agencies rely on incentive-based commission as companies are expanding their IMC programs.
D) Typically, agencies are unwilling to negotiate their commission rates.
E) Generally, agencies receive their highest commissions from direct mail and sales promotions.