Iterative development is due to the high uncertainty of the market. Before the demand is fully determined, the development starts quickly. Each cycle is not perfect, but it is necessary to continuously find new problems, acquire and accumulate new knowledge, and adaptively control Process, complete some functions of the system in one iteration, and then deliver immature products to leading users, and further refine the requirements through their feedback, so as to enter the next round of iteration, continuously obtain user needs and improve the product. Based on the above definition, which of the following is the following that does not belong to iterative development? ['Company A first introduces a minimalist prototype product to the market, verifies that the product meets user needs with minimal cost and effective methods, and then combines the requirements to quickly add components.', 'When company B develops products, it follows the pre-planned requirements, analysis, design, coding, and test steps are carried out in order to successfully develop new products.', "A company's product was removed from the previous beta version after 5 years of launch and became a stable product.", 'Ding adopts the model of open source software on the software it develops, and upgrades the software jointly with users.']