Marriott rewards customers earn points whenever they stay at any marriott property. louis is in this program, and he travels quite a bit because he works in sales. he usually stays at a courtyard by marriott, and when he walks into the lobby, there is a sign by the desk welcoming him by name as well as other marriott rewards customers who might be staying there. this ongoing relationship between louis and marriott is an example of

(a) relationship marketing
(b) internal marketing
(c) personal marketing
(d) formal marketing
(e) acquisition marketing