Isaac Corp. has very good relations with its customers, who have several ways to give feedback about the company products. Customers can login to the company's website, call customer support, or even walk into the nearest outlet and register their complaints. The company always takes the feedback positively, implements it, and creates an improved version of the product. Which model of public relations is used by the company? A. Public information B. Press publicity C. Two-way asymmetric D. Two-way symmetric