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Which option correctly identifies with the development sequence of the philosophy of marketing?
A.Production era, sales era, marketing department era, and marketing concept era.
B.Marketing department era, production era, sales era, and marketing concept era.
C.Production era, marketing department era, sales era, and marketing concept era.
D.Sales era, production era, marketing concept era, and marketing department era.
What is A. Production era, sales era, marketing department era, and marketing concept era.