I am running 3 virtual machines using VirtualBox. First Two virtual machine is running windows Server 2012 and the last virtual machine is windows 8.1. The first virtual machine is root domain controller and the second one is the child domain. The third virtual machine which is windows 8.1 should be the client. How can I join the client with the child domain. The information about the client is in the second picture. I changed the ip address on the windows 8.1. Now I opened system properties using the command sysdm.cpl. What should I do now? Please Help.

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