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

Answer: D