Freelance mode refers to the conversion of some people's wisdom, knowledge, abilities, and experience into actual gains through the Internet. They solve problems in science, technology, work, work, and learning on the Internet to allow knowledge, experience, and skills Generate economic value. Based on the above definitions, which of the following is a freelance model? ["A non-profit website set up by a college student to answer primary and secondary school students' free questions has been well received by students and parents. A local educational institution sponsored the expansion of this website to help more students.", 'An IT technician started a small company in his spare time, mainly helping others repair computers remotely on the network.', 'A college graduate opened a clothing store on a B.2C. Website, using his network of resources to make the online store quickly profitable.', "The photographic work on a film artist's personal website attracted a large number of netizens to browse and forward it. Later, the photographer relied on publishing photographic equipment ads on the website to bring a lot of income."]