You create an application by using Microsoft Visual Studio .NET 2008 and the .NET Framework 3.5. You have a pre-defined database schema. You plan to design a business object layer in the application. The business object layer must map each database table in the schema to an object in the layer. The application must provide support for different database providers. You need to identify a technology to implement the business object layer by using the minimum amount of development effort. Which technology should you use?

A.
LINQ to SQL

B.
LINQ to XML

C.
Microsoft Sync Framework

D.
ADO.NET Entity Framework