You need to modify the entities in the designer

###BeginCaseStudy###

Topic 2, ASP.NET MVC
Background
You are developing an ASP.NET MVC application in Visual Studio 2012 that will be used to
process orders.
Business Requirements
The application contains the following three pages:
A page that queries an external database for orders that are ready to
be processed. The user can then process the order.
A page to view processed orders.
A page to view vendor information.
The application consumes three WCF services to retrieve external data.
Technical Requirements
Visual Studio Solution:
The solution contains the following four projects.
ExternalQueue: A WCF service project used to
communicate with the external order database.
OrderProcessor: An ASP.NET MVC project used
for order processing and logging order metadata.
OrderUpload: A WCF service project used to
submit order data to an external data source.
Shipping: A WCF service project used to acquire
shipping information.
ExternalQueue Project:
Entity Framework is used for data access. The entities are defined in the ExternalOrders.edmx
file as shown in the following diagram.

The project contains two services defined in the following files.
IExternalQueueService.es
ExternalQueueService.svc.
The ExternalQueue.Helpers namespace contains a definition for a class named OrderNotFound
Exception.

OrderProcessor Project:
Entity Framework is used for data access. The entities are defined in the ProcessedOrders.edmx
file as shown in the following diagram.

The classes are contained in the OrderProcessor.Entities namespace. The project contains the
following two controllers.
InboundQueueController.es
ProcessedOrderController.es
WCF service proxies to the ExternalQueue, Shipping and OrderUpload services have been
generated by using the command prompt. The ExecuteCommandProcedure() method in the
ExternalQueueService.svc file must run asynchronously.
The ProcessedOrderController controller has the following requirements.
The GetVendorPolicy() method must enforce a 10 minute absolute cache expiration policy.
The GetProcessedOrders() method must return a view of the 10 most recently processed orders.
OrderUpload Project:
The project contains two services defined in the following files:
IUploadCallbackService.es
UploadCallbackService.svc
Data Access is maintained in a file named UploadOrder.es.

Shipping Project:
Entity Framework is used for data access. The entities are defined in the ExternalOrders.edmx
file as shown in the following diagram.

The Custom Tool property for ExternalOrders.edmx has been removed.
POCO classes for the Entity Model are located in the ShippingAddress.es file. The POCO entity
must be loaded by using lazy loading.
The project contains two services defined in the following files.
IShippingService.es
ShippingService.svc.
The IShippingService contract must contain an operation that receives an order number as a
parameter. The operation must return a class named ShippingInfo that inherits from a classnamed State.

Application Structure

###EndCaseStudy###

The QueueDetail entity type must inherit from the InboundQueue entity type in the ExternalQueue service
project using table-per-type inheritance.
You need to modify the entities in the designer.
What should you do? (Each correct answer presents part of the solution. Choose all that apply.)

A.
Remove the OrderNum property in InboundQueue.

B.
Remove the OrderNum property in QueueDetail.

C.
Set the QueueDetail BaseType to InboundQueue.

D.
Remove the association between the entities.

E.
Right-click the entities and validate the table mapping.

F.
Set the InboundQueue BaseType to QueueDetail.

Explanation:
http://www.robbagby.com/entity-framework/entity-framework-modeling-table-per-type-inheritance/