The crime of producing and selling fake and inferior products refers to the act of the manufacturer or seller deliberately adulterating, adulterating, subpriming, substituting false or false products as qualified products, and selling more than 50,000 yuan. Which of the following is the crime of producing and selling counterfeit products? ['Lai Mou, Xuan Mou negotiated that the chemical raw material selenium dioxide was mixed with ammonia sulfate and sold as pure selenium dioxide, and 425 kg was sold at a contract price of 430 yuan per kilogram.', 'Chen sold fake gold necklaces as pure gold necklaces, each 24 grams of gold necklace, valued at RMB 4,600, and sold three.', 'A construction company constructs a residential building valued at 3 million yuan. In order to reduce costs, unqualified building materials were used, resulting in cracks in the residential building before acceptance.', 'Meng Mou pretended to be a new car with a used car, and signed a car sales contract with Xiao Mou at a price of 300,000 yuan, but Meng Mou fled after the car was in hand.']