Which sentence best summarizes the paragraph's main idea.
1.over the past 60 years, organizations have become much more complex.
2.In the last 60 years, strategic marketing has moved from product-focused, to customer-focused, to company vision and philosophy.
3.There has been a lot of disagreement and argument about changes in production since 1960
4.customer's needs become important to organization's strategies between 1960 and the early 2000s.