What should you create first?

You have a deployment of Microsoft System Center 2012 R2 Configuration Manager. All site
system roles are deployed. All client computers have the Configuration Manager client installed.
An application named App1 is deployed to all of the client computers.
Your organization licenses App1 annually from the application vendor. The licenses are based on
the number of App1 installations that exist in the organization at the end of the fiscal year.

You need to identify on which computers App1 is not being used.
What should you create first?

A.
a configuration baseline

B.
an automatic deployment rule

C.
a software category

D.
a software metering rule

Explanation:
https://technet.microsoft.com/en-us/library/gg682005.aspx