Which of the Following Is an Example of a Fixed

Which of the following is an example of a fixed fee system of compensation?

A) 15 percent of the total amount billed by XL Inc.was retained by Tesco advertisers as compensation for all costs in creating the advertisement.
B) Largo advertisers was paid $50,000 by their client based on the effect their ads had on the sale of the company's products.
C) Purple Corp.paid RL Designs $150,000 based on the positive responses it received for their promotions from their customers.
D) HK advertisers and their client agreed on which supplies, materials, travel costs, and other expenses will be reimbursed.