Which tool should you use?

Your network contains an Active Directory domain named contoso.com. The domain contains
hundreds of groups, many of which are nested in other groups.
The domain contains a user account named user1.User1 is a direct member of 15 groups.
You need to identify of which Active Directory groups User1 is a member, including the nested
groups. The solution must minimize administrative effort.
Which tool should you use?

A.
Active Directory Users and Computers

B.
ADSI Edit

C.
Get-ADUser

D.
Dsget

Explanation:
http://technet.microsoft.com/en-us/library/cc732535.aspx