Scenario: An administrator wishes to add disaster recovery capability to an existing XenApp environment. The administrator built some new servers into a disaster recovery datacenter that has a 1 GB link to the production datacenter. How should the administrator configure the new servers for users?
A. Add the servers to the existing farm in the same zone and use a custom load evaluator.
B. Add the servers to the existing farm in the same zone and use a worker group and load balancing policy.
C. Add the servers to a new farm and use the site failover feature of Web Interface to provide access to the servers.
D. Add the servers to the existing farm into a new disaster recovery zone and use a preferential load balancing policy.
D
https://docs.citrix.com/en-us/citrix-virtual-apps-desktops-service/manage-deployment/zones.html