You need to call a function that is defined in the conceptual model from within the LINQ to Entities queries

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The
application connects to a Microsoft SQL Server database. You use the ADO.NET LINQ to Entities
model to retrieve data from the database. You need to call a function that is defined in the
conceptual model from within the LINQ to Entities queries. You create a common language runtime
(CLR) method that maps to the function. What should you do next?

A.
Declare the method as static

B.
Declare the method as abstract

C.
Apply the EdmFunctionAttribute attribute to the method

D.
Apply the EdmComplexTypAttribute attribute to the method.

Explanation:
CHAPTER 6 ADO.NET Entity Framework
Lesson 1: What Is the ADO.NET Entity Framework?
Model-Defined Functions (page 413-414)