HOTSPOT
You have a server named Server1 that runs Windows Server 2012 R2.
You need to switch Server1 to a Server Core installation of Windows Server 2012 R2.
What command should you run?
To answer, select the appropriate options in the answer area.
Answer: 
Accordingly to all the resources that I found, removing server-gui-mgmt-infra, won’t remove server-gui-shell, and it will result in a 2012R2 Minimal Server Interface Installation.
As stated in MSDN (https://msdn.microsoft.com/pt-br/library/hh831786(v=ws.11).aspx)
For example, to completely remove Windows Explorer, Internet Explorer, and dependent components, run the following Windows PowerShell command:
Uninstall-WindowsFeature Server-Gui-Shell -Remove
To me, this is incomplete, but, if I find this on the test, I’ll mark only the first one, since everywhere is stating this.
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I agree with you Theles
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The given answer is correct.
If you run Uninstall-WindowsFeature server-gui-mgmt-infra from a “server with a GUI” installation, all GUI interfaces will be removed, resulting in a “Server Core” installation. You will be left with only command prompt and PowerShell.
From Microsoft: “If you convert to a Server Core installation, Windows features, server roles, and GUI management tools that require a Server with a GUI installation will be uninstalled automatically.”
https://technet.microsoft.com/en-us/library/hh831786(v=ws.11).aspx
Running uninstall-windowsfeature server-gui-shell will give you a “Minimal Server Interface” installation. This will remove most of the GUI interfaces on the server; only Server Manager, a subset of Control Panel items, and MMC will remain (command prompt and PowerShell will also be available).
You don’t need to run uninstall-windowsfeature server-gui-shell before running uninstall-windowsfeature server-gui-mgmt-infra.
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To convert a Windows Server 2012 R2 Server Core installation to the full GUI option, use the following Windows PowerShell command:
Install-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell –Restart
To convert a full GUI server installation to Server Core, use the following command:
Uninstall-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell -Restart
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