Microsoft Exam Questions

What can ensure this?

DRAG DROP
There is MS Visual Studio 2010 and MS .NET Framework 4 application PassGuideApp.
PassGuideApp is running on a server PassGuideSrv.
PassGuideApp uses this service to connect to a MS SQL Server 2008 database PassGuideDB
located on a separate server PassGuideData.
To access employee data from PassGuideDB ADO.NET Entity Framework is used.
Changes to the data can be made locally, in disconnected mode, on PassGuideSrv, but
when a user of PassGuideApp access PassGuideData, the these local changes data must
be updated with this latest data to PassGuideSrv.
What can ensure this?

Answer:

Explanation: