How to add Windows 2012 R2 as new domain controller in the existing Windows 2008 R2 domain.

[Akbar4545]

In our environment we had three domain controller as single forest and all the servers on windows 2008 R2, one is located at branch office in different region, two at Head Office among which one is PDC. Additional DC has crashed today ( Hardware failure), now i am planning to have Windows 2012 R2 DC on new Hardware. kindly suggest the best practice to achieve this. kindly note i had Wins and Certification authority also on the crashed server.

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