1. A REA diagram has seven distinct entities. Among these 7 entities, there are one NiN relationships and seven 1:N relationships. How many tables are needed to implement this. REA diagram in a relational database? a) 7 b) 8 c) 14 d) 15 2. Assume that an accounts payable application contains database tables for purchase orders, inventory items, vendors, and purchasing agent. Which of these items would be likely data fields in a purchase order table except: a) purchasing agent name b) purchasing agent number c) date of order d) order number 3. Assume that an accounts payable application contains database tables for purchase orders, inventory items, vendors, and purchasing agent. Which of these items would probably be a foreign key in the purchase orders table? a) order number b) purchasing agent name c) purchasing agent number d) all of these