Exclusive agency means that the client only appoints one agent in the designated area and within a certain period of time. The agent only takes the commission and has no profit or loss. It has no right to determine the price of the product, and it must not accept commissioning to operate the same or similar products. Which of the following may be exclusive agents? ['Xiaoqiang is the largest business agent of a brand winery in a certain city. He is enthusiastic in service and often buys goods for customers. When the customers are in large quantities, he will take the initiative to give some benefits to the customers.', 'Xiao Zhang started working as a dealer for a famous leather shoe three years ago. He gets a commission of 70,000 to 80,000 a year. As the business is getting more and more popular, he has started the distribution business of three or four leather shoe factories.', 'Xiaofan in Nanjing and Xiaoqiu in Wuhan both accepted the agency business of a famous shoe company. They are in good condition and can get hundreds of thousands of commissions each year.', 'Xiaocai founded the Craft Porcelain Factory, not only designing the style of the product himself, but also controlling the whole process of firing himself, and the sales of finished products are rising year by year.']