Your network contains a single Active Directory domain named contoso.com.
System Center 2012 R2 Configuration Manager Service Pack 1 (SP1) is deployed to contoso.com.
You need to inventory the installed software on Windows Phone and iOS devices.
What should you do first?
A.
Configure Software Inventory.
B.
Add a Microsoft Intune subscription.
C.
Configure Network Discovery.
D.
Install the Configuration Manager client.
E.
Enroll the mobile devices.
Explanation:
Software inventory must be enabled for clients to collect inventory.
Prerequisites for Software Inventory
https://technet.microsoft.com/en-us/library/hh696545.aspx