In the Context of Promotion Strategies, Which of the Following

In the context of promotion strategies, which of the following is an example of engaging in postpurchase communication?

A) An airline hiring an actor to act in a series of commercials endorsing its services
B) An insurance company using an umbrella as its logo to convey that its customers are well-protected
C) A chartered accountant firm offering a 20 percent discount to customers who avail its services in January
D) A hotel sending an e-mail survey to its guests asking them to rate the quality of service that they received