Hotspot Question
You have a deployment of Microsoft System Center 2012 R2 Configuration Manager.
All client computers have the Configuration Manager client installed.
You deploy two applications named App1 and App2. App1 is a large application that is used
infrequently.
Some users receive notifications indicating low disk space on their client computer.
You need to uninstall App1 from any client computer that has both App1 and App2 installed and
that has less than 1GB of free disk space.
What should you do? To answer, select the appropriate options in the answer area.
Answer: 
Explanation:
https://technet.microsoft.com/en-gb/library/gg682013.aspx
Correct. A configuration item would be correct, but it still requires a configuration baseline to be deployed so it’s not a complete solution. So Creating a device collection that uses a query rule would be the right answer. Creating a deployment for App1 which you can set as “Uninstall”.