A product recall is when a manufacturer recalls a product that has been delivered to a wholesaler, retailer, or end user. The typical reason for a product recall is that the product sold is found to be defective. The product recall system is for batches caused by manufacturers. Sexual problems arise, among them, the identification of quality defects and the identification of manufacturers' responsibilities are the most critical core. According to the above definitions, Which of the following are product recalls:. ['A merchant promises that the product can be returned unconditionally if there is a problem.', 'A supermarket finds that the cans sold have expired and deteriorated, and promptly inform consumers to return or replace them.', 'Due to inadequate quality control, a batch of products from a factory flowed into the market, and the manufacturer informed consumers to return.', "A toy factory returns compensation to some consumers who filed a lawsuit because a certain toy's harmful substance exceeds the standard."]