Which Group Policy preference should you configure?

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

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.
Before you create an Environment Variable preference item, you should review the behavior
of each type of action possible with this extension.