"Customer Service" Has Traditionally Been Considered to Be a Company's

"Customer service" has traditionally been considered to be a company's efforts to answer inquiries and handle complaints. But Price and Jaffe offer ideas about how to fix service more systemically, by preventing the need for "service." These include all of the following except:

A) Measure the efficiency of the call center by counting the number of calls that are handled per hour.
B) Create engaging self-service.
C) Make it easy to contact the company.
D) Make customer service part of the responsibility of billing, IT, credit, finance, and manufacturing.