Which ADO.NET data access strategy should you use?

You are designing a data‐oriented application that features a variety of storage schemas.
The application object model must be mapped to the various storage schemas.
You need to enable developers to manipulate the data.
Which ADO.NET data access strategy should you use? (Each correct answer presents a complete
solution. Choose all that apply.)

A.
LINQ to SQL

B.
Entity Framework

C.
DataAdapter

D.
DataReader