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Analysis of test questions: The "brand" in the test questions refers to the reputation and image of the company, which is reflected by the quality of the company's products and the service system. To maintain the company's image and establish a brand, we need to ensure that the company provides high-quality products and services, and we need the joint efforts of the company's employees. Therefore, ② ⑤ is correct; ① ④ There are deviations and mistakes in understanding; (3) too absolute, wrong. Choose b for this topic.