The economy of scope is an economy brought by the business scope of the manufacturer rather than the scale. It is an economic phenomenon that the cost of batch production of two products is lower than the cost of separately producing the first product. According to the above definition, which of the following is scope economies? ['A beer factory has acquired a small brewery with a loss in operation. After the production line is expanded, the cost of raw material procurement is reduced, and the production efficiency of beer in both factories is improved.', 'After a furniture manufacturer implements a combination of tables and wardrobes, the same production process reduces costs effectively.', 'Due to the expansion of market demand, the manual workshop production of cloth shoes and insoles has gradually been replaced by machine production, and the production cost has dropped significantly.', 'A dairy factory implements the production of cheese and yogurt together. The two production processes draw on each other, the product is improved, and the sales volume is greatly increased (the cost is not involved).']