Question：Chaffey outlines three sequential phases of CRM in e-business and e-commerce management.
　　What are they?
　　A. Acquisition, Extension, Retention
　　B. Acquisition, Extension, Promotion
　　C. Acquisition, Retention, Extension
　　D. Acquisition, Promotion, Extension
　　The correct answer is: Acquisition, Retention, Extension.
　　解析：Customer acquisition involves attracting customers for their first purchases.
　　Customer retention involves making sure customers return and make a second purchase; in other words, that they are retained as customers.
　　Customer extension means introducing products and services to loyal customers that may not wholly relate to their original purchases. This encourages customers to make additional, supplementary purchases.