(a) Structure the following data elements into a relational database structure; indicate the primary and foreign keys for each table you define. Use the answer format given below when answering the relational database questions. You may need to add additional fields to be able to properly structure your database: (b) Draw an entity relationship map (ERM) to represent your database. Item number Quantity on hand Customer name Cost Price Shipping address Description Invoice number Billing address Date of sale Terms of sale Credit limit Quantity sold Sale Price Account balance An example answer table is on the next slide