Based on the below Entity-Relationship Diagram, is this database normalized in 4NF (Fourth Normal Form)? If not, SHOW and EXPLAIN ALL STEPS to make this database be normalized into 4NF. Employee/Customer- SALESOFFICES AccountNumber FirstName LastName PhoneNumber Location OfficeID Location PhoneNumber Assigned Regions EMPLOYEES H EmployeelD FirstName LastName Extension OfficeID CUSTOMERS Customer/Orders.... 04 --Employee/Orders ORDERS InvoiceNumber Product Quantity OrderCost PurchaseDate ShipmentDate PaymentDate ProductNumber Product/Order PRODUCTS ProductNumber Product Cost Description