Happy Traveler Ltd. has designed a program that rewards with points each time they hire the company to book their holidays. It has also introduced discounted Christmas and New Year holiday vacation packages exclusive to members and long-time customers. Happy Traveler Ltd. has also expressed its support for a cancer foundation, donating a substantial sum of money to the foundation. The cancer foundation has announced Happy Traveler Ltd. as one of its patrons. Happy Traveler's reward points program for its members is an example of:

a. sales orientation.
b. corporate social responsibility.
c. promotional partnership.
d. customer relationship management.