You are designing an n-tier .NET Framework 4 solution that includes a Windows
Presentation Foundation (WPF) application. The WPF application will access data stored in

a Microsoft SQL Server 2008 database by using the solution’s data access tier. The data
access tier must also be available from within Microsoft Excel 2010. You need to
recommend a technology for accessing the data access tier. Which technology should you
recommend?

A.
LINQ to XML

B.
ADO.NET Entity Framework 4

C.
LINQ to SQL

D.
WCF Data Services