Which feature was first introduced with windows server 2012 r2, and are new active directory containers to which authentication policies can be applied to restrict where high-privilege user accounts can be used in the domain?

The feature which was first introduced with Windows Server 2012 R2 and are new active containers:

Authentication Policy Silos

Explanation:

Authentication Policy Silos:

These are the containers that are used by the administrators to impose limits on the different user accounts. This also helps the administrator to prevent the hackers from theft of different resources on user accounts. These containers can be used to restrict the high-privilege user accounts in the domain.

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