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’
