Complementary products refer to the existence of a certain type of consumption dependence between two products, that is, the consumption of one product must be matched with the consumption of another product. They can be divided into two categories. Ordinary complementary products refer to two products. There is no fixed ratio of simultaneous use; completely complimentary products refer to the fact that two products must be used simultaneously in a fixed and constant ratio. Based on the definition above, which of the following is options correct? ['French fries and burgers are common complements.', 'Spectacle frames and lenses are completely complementary.', 'Brushes and ink are completely complementary.', 'Digital photo printer and film are common complementary products.']