You need to implement a disaster recovery plan for your domain controllers, which are utilized in your AVD deployment. These domain controllers are currently deployed in the West Europe region. Your design must provide a region failure solution. Which of the following would you include in the plan?

Answer options:

A.Create a site-to-site(S2S) VPN with your on-premises network
B.Create a point-to-site(P2S) VPN with your on-premises network
C.Implement two domain controllers in the North Europe region
D.Implement two domain controllers in an availability zone

Correct Answer: C 
Implementing additional domain controllers in the North Europe region can be included in the BCDR plan for Azure Virtual Desktop in case of a region failure. This will ensure the availability of authentication services in a region failure scenario.
Option A is incorrect. An S2S VPN will provide a connection to the on-premises network but it will not protect the domain controllers during the region failure.
Option B is incorrect. Creating a point-to-site(P2S) VPN won’t help in achieving the goal.
Option C is correct. Implementing additional domain controllers in the North Europe region will ensure the availability of authentication services in a region failure scenario.
Option D is incorrect. Availability zones protect your domain controllers from a datacenter or zone failure in a single region only. They don`t protect if the full region fails.
Reference: 
To know more about Azure Virtual Desktop disaster recovery, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/virtual-desktop/disaster-recovery