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 cannot keep track of promotions that are not associated with multiple products We must keep track of promotions that are not associated with any products We can keep track of promotions that are not associated with any products We cannot keep track of promotions that are not associated with any products None of the above