Your network contains an Active Directory domain named contoso.com.
The domain contains a server named SERVER1 that runs Windows Server 2012.
SERVER1 has the IP Address Management (IPAM) Serverfeature installed.
IPAM is configured currently for Group Policy-basedprovisioning.
You need to change the IPAM provisioning method on SERVER1.
What should you do?

A.
Run the ipamgc.exe command.
B.
Run the Set-IPAMConfiguration cmdlet.
C.
Reinstall the IP Address Management (IPAM) Serverfeature.
D.
Delete IPAM Group Policy objects (GPOs) from the domain.
Explanation:
You cannot change the provisioning method after completing the initial setup.
you could only go from manual to auto(group policy) not vice versa.
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Provided answer is correct, but even if you choose manual and you then want to change to GP Based, you have to reinstall the feature:
“The choice of a provisioning method is permanent for the current installation of IPAM Server. To change the provisioning method, you must uninstall and reinstall IPAM Server.”
https://technet.microsoft.com/en-us/library/jj878310.aspx
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