Question on running Prepare Current Forest

First question is am I supposed to select "Local domain" or enter the Domain FQDN of the domain that the Front End server is a member of?
2nd is When running the Prepare Current Forest task and selecting Local domain I'm receiving error:
Prepare Forest Active Directory settings execution failed on an unrecoverable error.
Creating new log file "c:\users\........
Warning: Enable-CSAdForest failed.
Command execution failed: Value cannot be null.
Parameter name: instanceToDelete
Again I'm not sure if I'm supposed to select Local domain or enter the FQDN of the domain that the server is a member of...

Hi - I resolved the issue thanks to this info at https://social.technet.microsoft.com/Forums/office/en-US/827804c1-690b-45c3-93d8-426c66a9a82c/forest-preparation-failed-lync-2013-std-object-reference-not-set-to-an-instance-of-an-object?forum=lyncdeploy
providing  GroupDomain, GroupDomainController
and GlobalCatalog worked for me..!!
Thanks!

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