You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application uses the ADO.NET Entity Framework to manage customer and related order records. You add a new order for an existing customer. You need to associate the Order entity with the Customer entity. What should you do?

• Set the Value property of the EntityReference of the Order entity.
• Call the Add method on the EntityCollection of the Order entity.
• Use the AddObject method of the ObjectContext to add both Order and Customer entities.
• Use the Attach method of the ObjectContext to add both Order and Customer entities.