Scenario: A NetScaler engineer configured a service and server for RADIUS authentication. To ensure that the
RADIUS service is available and responding to authentication requests, the engineer has added the NetScaler
built-in monitor to the service. On inspecting the RADIUS service the engineer notices it is marked as DOWN.
What could be causing this issue?

A.
The built-in monitor has been changed.

B.
RADIUS accounting must be enabled under the server.

C.
There is no built-in monitor available to monitor RADIUS.

D.
The NetScaler-owned IP address has not been added to the RADIUS database.