AD Schema Upgrade

I am currently in Windows 2008 AD Mode. I recently introduced 2 Windows 2012 R2 Domain Controller in 1 of our 4 sites.
I am looking to use gMSA feature. However it seems I have to extend the schema.
Is it possible to extend it with only 2 of 8 Domain Controllers being 2012R2?
If so, can on use gMSA on sites that only have 2008 DCs?
GGHCAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The schema is already extended - it was done when you introduced the first 2012 R2 server.

Requirements are here:
https://technet.microsoft.com/en-us/library/jj128431(v=ws.11).aspx
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GGHCAuthor Commented:
Great! Thanks! Would the gMSA account have admin rights even on Domain Controllers?
For Example I have a task that needs to delete a file from the \System32\ on all Computers in domain. Can the gMSA account be able to do that? Anything special needed for that?
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