You are developing an application in Visual Studio 2012 to display student information. The
application contains the following Entity Framework model.

The application contains a WCF data service named DirectoryService.svc.
You need to create a query expression to display all of the grades for students whose first
name is “John”
How should you build the expression?

A.
http://localhost:54946/DirectoryService.svc/Students?$filter=FirstName eq ‘John’
&$expand=Grades

B.
http://localhost:54946/DirectoryService.svc/Students?$filter=FirstName eq ‘John’/Grades

C.
http://localhost:54946/DirectoryService.svc/Students?$filter=FirstName = ‘John’
&$expand=Grades

D.
http://localhost:54946/DirectoryService.svc/Grades/Students?$filter=FirstName eq ‘John’