The formula is contaminated by Enterobacter sakazakii mainly from two sources: one is that the milk powder itself contains a small amount of Enterobacter sakazakii; the other is that it enters the formula through the surrounding environment and bacteria-contaminated appliances or hands. Therefore, the World Health Organization recommends Water below 70 degrees Celsius to prepare infant formula. If the following statement is true, which one is the premise of the above conclusion? ['The main cause of infantile diarrhea is Enterobacter sakazakii.', 'Water above 70 degrees Celsius can kill Enterobacter sakazakii.', 'Water temperature below 70 degrees will not affect the nutrition of milk powder.', 'Most bacteria cannot survive in boiling water.']