Differential market strategy refers to the design and production of different products based on the needs of each market segment based on the overall market segmentation of the company, formulating and implementing different marketing mix strategies (a combination of various marketing methods) (Application), trying to meet the different market needs with different products. According to the above definitions, Which of the following are different market strategies:. ['An automobile production company is oriented to the working class, and mainly produces economical cars. This type of car has a low price and low fuel consumption, and is popular with the working class.', 'A supermarket implements a membership system and gives gifts of different grades according to the number of member points.', 'Computers produced by a certain company sell well in the market, and in order to broaden the market, they began to develop mobile phones.', 'A cosmetics manufacturer produces and sells different types of body lotions to consumers at different ages.']