Targeted regulation refers to the government's clear and clear regulatory policies for different regulatory areas to make the regulation more targeted. Camera regulation refers to the government's flexibility to decide which policy or policies should be adopted based on market conditions and the characteristics of various regulatory measures. Measures focus on "pre-adjustment, fine-tuning". Directional control is "what" and camera control is "how to". According to the above definition, which of the following is camera controls? ['At the beginning of the year, the government of country A proposed work targets such as the "lower limit" of economic growth rate and employment level, and the "upper limit" of the price increase.', 'The government of country B proposes a "dual engine" strategy: one is to reduce the burden on market entities such as small and micro enterprises, and "three rural"; the other is to support the construction of public products and public services, and to promote investment. Specific measures will be formulated by localities.', 'The government of country C has formulated targeted deed tax and mortgage policies based on the different characteristics of the real estate market in Tier 1, 2 and 4 cities.', 'The economic policy of the Ding Guo government on the production and sale of products and services is completely guided by the free price mechanism of the free market and the property rights are clear.']