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.
Ini Files

B.
Data Sources

C.
Services

D.
Environment

Explanation:
Environment Variable preference items allow you to create, update, replace, and delete user and system
environment variables or semicolon-delimited segments of the PATH variable.
Note:
Creating an Environment Variable item
To create a new Environment Variable preference item