HOTSPOT
Your network contains an Active Directory domain named contoso.com. All servers run Windows
Server 2012 R2.
You need to add a user named User1 to a group named ServerAdmins.
What command should you run? To answer, select the appropriate options in the answer area.
Answer: 
This is correct (although it is easier to distinguish if you have it laid out like Add-ADGroupMember -Identity ServerAdmins -Member User1)
https://technet.microsoft.com/en-gb/library/ee617210.aspx