Concerning the Universal Functions of Marketing,it Is True That

Concerning the universal functions of marketing,it is true that

A) the functions must be performed in all macro-marketing systems.
B) the functions can be performed by producers or intermediaries-but not by consumers.
C) from a micro viewpoint,every firm must perform all the functions.
D) responsibility for performing them can be shifted and shared-and some functions can be completely eliminated to reduce costs.