Scenario 2-5 In 2008, Chicago Native Andrew Mason Launched Groupon, a Website

Scenario 2-5
In 2008, Chicago native Andrew Mason launched Groupon, a website that offered Chicago-based consumers various "deals of the day." At the time, Groupon had a unique business model-each day, one "Groupon" would be offered in a particular city. If a certain number of people signed up for the offer, then the deal became available to all. Now, years later, the business continues to grow, and the service is being offered in many U.S. cities. Google made a multi-billion dollar offer for the company that Mason turned down in December of 2010. Continuing the company's rapid rise to success will be a challenging task, because the company will be the first to attempt to advertise the unique services. Groupon needs to find ways to attract new users, and looking into new forms of advertising will be essential to the company's success.
-(Scenario 2-5) Groupon decides to find a firm that can help them in planning,preparing,and executing promotional campaigns.The company whose services Groupon is seeking is referred to as a(n) : 

A)  client. 
B)  database consultant.  
C)  sponsor. 
D)  external facilitator.