You need to configure GPO1 to Apply settings to Group1 only

Your network contains an Active Directory domain named contoso.com. The domain contains more than 100
Group Policy objects (GPOs).
Currently, there are no enforced GPOs. The domain contains a top-level organizational unit (OU) for each
department. A group named Group1 contains members from each department.
You have a GPO named GPO1 that is linked to the domain.
You need to configure GPO1 to Apply settings to Group1 only.
What should you use?

A.
Dcgpofix

B.
Get-GPOReport

C.
Gpfixup

D.
Gpresult

E.
Gptedit.msc

F.
Import-GPO

G.
Restore-GPO

H.
Set-GPInheritance

I.
Set-GPLink

J.
Set-GPPermission
K.
Gpupdate
L.
Add-ADGroupMember

Explanation:
http://technet.microsoft.com/en-us/library/ee461038.aspx