Commission: The social material rewards obtained by providing intermediary services for others through their independent labor. Which of the following are commissions:. ['Xiao Li founded a headhunting company to introduce talents for employers, and charges service fees to employers based on a 30% annual salary of the talents they have introduced.', 'Wang Feng is the chairman of the listed company, with an annual salary of 2 million yuan last year.', 'Aunt Li used her savings for many years to buy a set of houses along the street to rent to others for rent. The monthly rent is 5,000 yuan.', 'It is verified that the work of the sales manager is very well received by customers. Last month, the boss of the company customer Liu personally sent a red envelope of 10,000 yuan.']