You need to prevent User1 from receiving the error message when editing DHCP scopes by using IPAM

Your network contains an Active Directory domain named contoso.com. All servers run
either Windows Server 2008 R2 or Windows Server 2012.
Your company uses IP Address Management (IPAM) to manage multiple DHCP servers.
A user named User1 is a member of the IPAM Users group and is a member of the local
Administrators group on each DHCP server.
When User1 edits a DHCP scope by using IPAM, the user receives the error message
shown in the exhibit. (Click the Exhibit button.)

You need to prevent User1 from receiving the error message when editing DHCP scopes by using IPAM.
What should you do?

A.
Add User1 to the DHCP Administrators group on each DHCP server.

B.
Add User1 to the IPAM Administrators group.

C.
Run the Set-IpamServerConfig cmdlet.

D.
Run the Invoke-IpamGpoProvisioning cmdlet.

Explanation:
http://technet.microsoft.com/en-us/library/hh831622.aspx
IPAM Administrators: IPAM Administrators have the privileges to view all IPAM data and
perform all IPAM tasks.