Your network contains an Active Directory domain named contoso.com. All servers run Windows Server 2012 R2.
Client computers run either Windows 7 or Windows 8. All of the client computers have an application named App1 installed.
The domain contains a Group Policy object (GPO) named GPO1 that is applied to all of the client computers.
You need to add a system variable named App1Data to all of the client computers.
Which Group Policy preference should you configure?
A. Environment
B. Ini Files
C. Data Sources
D. Services