[单项选择]造成电信网络运营具有较高的市场退出壁垒的因素是（）。
A. 产品同质 
B. 产品异质 
C. 沉没成本大 
D. 无沉没成本 

Customer experience is the internal and subjective response customers have to any direct or indirect contact with a company. (1)Indirect contact most often involves unplanned encounters with representations of a company’s products, services, or brands and takes the form of word-of-mouth recommendations or criticisms, advertising, news reports, reviews, and so forth. Such all encounter could occur when Google’s whimsical holiday loges pop up on the site’s home page at the inception of a search, or it could be the distinctive "potato, potato" sound of a Harley-Davidson motorcycle’s exhaust system. (2)The secret to a good experience isn’t the multiplicity of features on offer. Microsoft Windows, which is rich in features, may provide what a corporate IT director considers a positive experience. (3)A customer’s experience with an Apple device such as the iPod begins well before the purchaser turns it on perhaps because of the dancing silh
A. Every Apple product is designed with the, overarching purpose of making the time one spends with Apple an enjoyable experience.
B. It might just be an e-mail from one customer to another.
C. Direct contact generally occurs in the course of purchase, use, and service and is usually initiated by the customer.
D. People’s expectations are set high in part by their previous experiences with a company’s offerings
E. In 2000. Mercedes-Benz introduced a system that automatically controls the distance between a Mercedes and the car in front.
F. However, many home users prefer Apple’s Macintosh operating system, which offers fewer features and configuration options.