Service-based public relations refers to the organization's public relations activities that focus on providing a variety of affordable services and obtain the public's understanding and praise through practical actions to build a good image of the organization. According to the above definitions, Which of the following are service-based public relations:. ['A water heater manufacturer regularly sends water heater use precautions to users and replaces the filter for users free of charge every year.', 'An environmental protection company announced through a TV program to provide one-time relief materials worth 500 million yuan to the disaster area.', 'A winery puts out a lot of advertisements on TV prime time to promote its new products.', 'The chairman of a pharmaceutical company publicly apologized to the consumer for the failure of a certain batch of drugs and resigned the relevant post.']