Knowledge marketing refers to the use of corporate advertising, promotion, and public attention to a certain amount of knowledge and cultural flesh in the marketing process of an enterprise, helping consumers to increase product-related and practical information and knowledge, and improve their consumption and quality of life. In order to achieve the purpose of promoting products, establishing an image, and improving brand competitiveness. According to the above definitions, Which of the following are knowledge marketing:. ['A health product manufacturer enters the community to provide a healthy life lecture for residents, and promotes its health products in the lecture.', 'A sports goods manufacturer donated sports goods worth 200,000 yuan to Hope Primary School, and many media reported this.', 'A normal university sends out a student support group. While supporting the teaching, the importance of sword education has played a positive role in the local enrollment of the school.', 'Stock analysts of a securities company are often invited by TV stations to perform stock analysis for the majority of shareholders in TV shows.']