Discuss the entities, attributes, and the relationship cardinalities presented in the Crow's Foot ERD. Write the business rules that are reflected in the following Crow's Foot ERD. An example of a business rule in the given ERD: Every customer can have many invoices. LINE CUSTOMER PK INV_NUMBER CUS_CODE INVOICE LINE_NUMBER CUS_LNAME RK INV_NUMBER LINE_UNITS CUS_AREACODE INV_DATE P_CODE CUS_INITIAL CUS_CODE LINE_PRICE CUS_BALANCE CUS_PHONE # PRODUCT CUS FNAME PK P_CODE VENDOR P_QOH V_CODE P_DISCOUNT V_NAME V_CODE V_CONTACT P_PRICE * V_PHONE P_MIN V_ORDER P_DESCRIPTION V_STATE P_INDATE V_AREACODE