Commission refers to the remuneration paid by the client to the broker, agent and other intermediaries after completing the commissioned matters. Which of the following options is a commission? ['A beer dealer gets a 10 yuan difference between the ex-factory price and the wholesale price.', 'Xiao Wang is a company employee, and the company pays him 2,000 yuan per month.', "A supermarket supplies and sells a certain brand of cigarettes, and the tobacco factory pays 10% of the supermarket's remuneration.", 'After Wang introduced, Xiao Li made a big business. In order to thank Wang, Xiao Li gave a 5,000 yuan red envelope.']