Suggested Answer:C🗳️
Directory synchronization between Azure Active Directory (Azure AD) and corp.fabrikam.com must not be affected by a link failure between Azure and the on- premises network. (This requires domain controllers in Azure) Users on the on-premises network must be able to authenticate to corp.fabrikam.com if an Internet link fails. (This requires domain controllers on-premises)
C
Active Directory servers. These are domain controllers implementing directory services (AD DS) running as VMs in the cloud. These servers can provide authentication of components running in your Azure virtual network.
If your application is hosted partly on-premises and partly in Azure, it may be more efficient to replicate Active Directory Domain Services (AD DS) in Azure. This replication can reduce the latency caused by sending authentication requests from the cloud back to AD DS running on-premises.
https://docs.microsoft.com/en-us/azure/architecture/reference-architectures/identity/adds-extend-domain
The requirement says
"User on the on-prem must be able to authenticate to corp.fabrikam.com if an internet link fails" --> meaning, you could keep at least on DS in the on-prem. This invalidates (A)
"ALL R&D remain on-prem", this invalidates (B) (D)
(C) is correct
Given answer is correct but explanation is wrong. Dirsync has no bearing on weather the link between on-prem Azure goes down.
So process of elimation
A - Wrong, no logic in moving all DC's to Azure when they still have on-premise workloads
B - Wrong, no point in doing this as it sates R&D are going to remain on-premise
D - Again wrong, the R&D is staying on-premise so why deploy an Azure AD tenant for it
C - seems like a good idea if they are trying to migrate stuff to Azure
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