Which authentication type can a Citrix Administrator use to enable Citrix ADC authentication,
authorization, and auditing (AAA) dual-factor authentication from a users mobile device app?
A
Reference:
https://docs.citrix.com/en-us/citrix-adc/current-release/system/authentication-and-authorization-forsystem-user/two-factor-authentication-for-system-users-and-external-users.html
LDAP Auth at the least, RADIUS is also possible
LDAP is the correct option, but RADIUS is possible too