Scenario:
A Citrix Administrator discovers that NO Desktop OS machines can register against a specific
Delivery Controller, Controller4, after maintenance over the weekend. The administrator logs into
Controller4 and finds all services are running. Pooled Desktop OS machines are registering with
other Delivery Controllers in the environment and users are able to connect successfully. What is
preventing the Desktop OS machines from registering with Controller4?

A.
SQL Server is offline.

B.
Windows Firewall is improperly configured.

C.
Controller4 was removed from NetScaler load balancing configuration.

D.
The Active Directory machine account for Controller4 was deleted from Active Directory.