Which of the following options would NOT effectively help Jen achieve her goal of preventing the mass collection of email addresses and other directory information from her web-accessible LDAP directory?

Rate limiting and back-off algorithms restrict the frequency of queries that can be made. Requiring authentication restricts access to the directory to authorized users only. While requiring LDAPS (Lightweight Directory Access Protocol over SSL) does not prevent enumeration, it does provide security for the information that passes through networks during queries.