Problem 2: Convert the following relation to an equivalent collection of relations that is in 3NF. This is relation concerns invoice information. For a given Invoice (INV), identified by invoice number, there will be a single Customer (CUST). INVOICE (INVNumber, CUSTNumber, CUSTName, CUSTAddresss, INVDate, \{PARTNumber, PARTDescription, UNITPrice, NumberShipped\}) The primary key (P.K.) and the Foreign Key (F.K.) of each relation must be identified in each normal form step. Hints: At the end, there should be 4 tables in the 3NF column