Which stage in the evolution of marketing was characterized by personal selling and advertising in order to persuade customers to buy new products or more of existing products?

Alex is the r& d manager with digital copier inc. the company is having a problem with one of its most popular copiers jamming. the vice president of marketing told alex that "we need to quickly discover how to turn this problem into a desirable situation. you need to determine the underlying cause of the problem and perhaps even make improvements to the copier." when alex analyzes the underlying causes of the paper-jam problem, which function is he performing? a. synergy b. diagnosis c. analytics d. feasibility e. mbo