Only when the purchase price of a flower shop is lower than the normal price, can the flower be sold at a price lower than the market to make a profit; unless the flower shop has a large sales volume, you cannot buy flowers from the flower farmer that are lower than the normal price. In order to have a large sales volume, the flower shop must satisfy consumers' personal interests or have exclusive sales rights for specific varieties. If the above assertion is true, which of the following must be true? ['If the florist buys flowers below the normal price from the florist, then it will make a profit to sell flowers at a price below the market.', 'If the florist does not make a profit by selling flowers below the market price, then he must not have purchased flowers from the flower farmer below the normal price.', 'The flower shop not only meets the personal interests of consumers, but also has exclusive sales rights for specific varieties, but still cannot profit from selling flowers at prices below the market.', 'If the flower shop makes a profit by selling flowers below the market price, the purchase price must be lower than the normal price.']