ABC RETAILER Observe the ER diagram for the ABC Retailer: This ER diagram will be used for the following questions citing ABC Retailer ER Diagram. Which of the following is true according to the ABC Retailer ER diagram? We can keep track of brands that have a single product We can keep track of brands that have multiple products We cannot keep track of brands that do not have any products We cannot keep track of products that belong to multiple brands All of the above