Scenario: A Citrix Administrator has configured an Authentication, Authorization, and Auditing (AAA) action policy to allow users access through the NetScaler.
The administrator bound the policy to a specific virtual server.
Which policy expression will allow all users access through the virtual server?
The correct policy expression to allow all users access through the virtual server is 'ns_true'. This expression means that the condition is always true, thereby permitting unrestricted access to the virtual server.
D. There is no ns_allow expression
D should be the answer, https://docs.citrix.com/en-us/netscaler/12/aaa-tm/configure-aaa-policies/ns-aaa-setup-policies-authntcn-tsk/ns-aaa-setup-policies-authntcn-advanced-tsk.html
There is no "NS_Allow" listed here. I think it should be NS_True. https://docs.citrix.com/en-us/netscaler/12/appexpert/policies-and-expressions/ns-p-class-expr-con.html#built-in-named-expressions-general
ns_true (D) is the right answer