Class Exercise: Normalizing from an Application View a. Use relation schema notation to specify the sales invoice form shown below: SALES INVOICE Invoice No: _____________ Date: ________________ Customer Name: _________________________________________ Address: _______________________________________________ Phone: ______________ Sales Person: __________________ Line Items: ItemNo Description Quantity Unit Price Item Total ------ ------------- -------- ---------- ---------- ______ _____________ ________ __________ __________ ______ _____________ ________ __________ __________ ______ _____________ ________ __________ __________ ______ _____________ ________ __________ __________ ______ _____________ ________ __________ __________ Invoice Total: __________ b. Normalize your data definition given for the sales invoice form in part a into a set of 3NF relations.