Answer:
writers
illustrators
photographers
Step-by-step explanation:
Advertising agencies are establishments that help customers to know and appreciate the importance of some goods and services. To convey these ideas to the public, writers, illustrators, photographers and showmen are engaged by advertising agencies to creatively bring out the benefits of these products.
Writers write about the benefits of the products both online and in papers. Illustrators and photographers use their pictorial skills to convey the benefits of some products. These group of artists are often represented among the staff of advertising agencies.