How can a Citrix Administrator provide two-factor authentication with tokens in a XenDesktop with NetScaler Gateway environment?

How can a Citrix Administrator provide two-factor authentication with tokens in a XenDesktop with NetScaler Gateway environment?
A . Create a SAML IDP policy and bind it to the existing virtual server.
B . Configure a TACACS authentication policy and bind it to the existing virtual server.
C . Configure a RADIUS authentication policy and bind it to the existing virtual server.
D . Create an authorization policy and bind it to the existing virtual server.

View Answer

Answer: C