At the onset of a XenDesktop 7.5 with NetScaler Gateway 10.5 proof-of-concept, users report they
are unable to access desktop and server OS machines.
Which configuration might be preventing users from accessing desktop and server OS machines?

A.
Single-hop DMZ with StoreFront
B.
Double-hop DMZ with StoreFront
C.
Single-hop DMZ with Web Interface
D.
Double-hop DMZ with Web Interface
This is correct. Think of Double-Hop DMZ like having 2 DMZs, where one DMZ is where just a Netscaler resides, and a 2nd DMZ has another Netscaler and Storefront. See these links for more info
https://docs.citrix.com/en-us/netscaler-gateway/10-5/ng-deployment-wrapper-con/ng-deploy-double-hop-con.html
http://blog.citrix24.com/storefront-double-hop-dmz-communication-flow/
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