HOTSPOT
Your network contains an Active Directory domain named contoso.com.
You install the IP Address Management (IPAM) Server feature on a server named Server1
and select Manual as the provisioning method.
The IPAM database is located on a server named SQL1.
You need to configure IPAM to use Group Policy Based provisioning.
What command should you run first?
To answer, select the appropriate options in the answer area.
Answer: 
Explanation:
Set-IpamConfiguration -ProvisioningMethod Automatic
Works in Windows Server 2012 R2.
confirmed. The book says that you can only go from manual to auto. It you want to do the opposite, you have to uninstall and reinstall IPAM.
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
Upon further research first comment is correct .
From Ref 70-417 Upgrading from Windows Server 2008 to Windows Server 2012 R2
You can use the following Windows Powershell command after completing the Provision IPAM wizard to change the provisioning method in one direction only – from manual to GPO based automatic
Set-IpamConfiguration -ProvisioningMethod Automatic
And its clearly marked as an exam tip