Which of the following statements is correct?

a) Marketing is the term used to refer only to the sales function within a firm.

b) Marketing managers don't usually get involved in production or distribution decisions.

c) Marketing is an activity that considers only the needs of the organization; not the needs of society as a whole.

d) Marketing is the activity, set of institutions, and processes for creating, communicating, delivering, and exchanging offerings that have value for customers, clients, partners, and society at large