107 4.3 Ashton wants to store the following data about S&S's purchases of inventory: item number date of purchase vendor number vendor address vendor name purchase price quantity purchased employee number employee name purchase order number description quantity on hand extended amount total amount of purchase a. Design a set of relational tables to store this data. Do all of the data items need to be stored in a table? If not, which ones do not need to be stored, and why do they not need to be stored? b. Identify the primary key for each table. c. Identify the foreign keys needed in the tables to implement referential integrity, d. Implement your tables using any relational database product to which you have access e. Test your specification by entering sample data in each table. f. Create a few queries to retrieve or analyze the data you stored