$15\mathrm{.}16\mathrm{.}18\mathrm{.}192021\mathrm{.}222324$Which statement best describes personnel in sales$-$oriented firms?O a$.$ They focus on selling the products which the organization makes rather than making what the market wants.O b$.$ They refrain from employing aggressive marketing and promotional measures to attract customers.O c They aim at preserving or enhancing individuals and society's long term best interests.O d$.$ They focus on determining the needs of both final buyer and intermediaries.