Gina Robertson is a sales representative with Coast-to-Coast Trans, a company that provides full service chartered flights—airplanes, pilots, staff, and services—to client groups. She has just closed a large sale of several flights each week for four months to a service organization of college students. The students are sent on work service projects all across the United States. The first flights will begin one week after the closing date. After the first flight, Gina would most likely build a long-term relationship with the new client by:

a. e-mailing a new flight schedule

b. sending an online customer service survey

c. calling the client to ensure satisfaction with the flight

d. requesting referrals from the client to engage in upselling

e. checking with the billing department to make sure the client was invoiced