Where do you verify that Smart Directory is enabled?

Where do you verify that Smart Directory is enabled?

A.
Global properties > Authentication> Use Smart Directory(LDAP) for Security Gateways is checked

B.
Gateway properties> Smart Directory (LDAP) > Use Smart Directory(LDAP) for Security Gateways is
checked

C.
Gateway properties > Authentication> Use Smart Directory(LDAP) for Security Gateways is
checked

D.
Global properties > Smart Directory (LDAP) > Use Smart Directory(LDAP) for Security Gateways is
checked