An audio-visual company produces a genuine music disc that sells for 50 yuan each, making a profit of 15 yuan. However, it is found in the market that pirated products sell for only 20 yuan each. Therefore, if 100,000 pirated discs are sold, it will cause 150 to the audio-visual company Loss of ten thousand yuan. In order for the above argument to be valid, what premise must be assumed? ['Because the relevant government departments crack down on the sale of pirated discs, many people do not have pirated discs to buy.', 'Many consumers can easily identify genuine and pirated discs due to different cover packages.', 'If there are no pirated discs, the company will sell no less than 100,000 genuine discs.', 'The selling price of the illegal disc was later reduced to 15 yuan.']