Which option should be used to disable anonymous binds to your LDAP directory?

The `disallow bind_anon` directive in `slapd.conf` explicitly forbids anonymous bind operations to the LDAP server, effectively preventing clients from connecting and performing operations without providing credentials.

The option `disallow bind_anon_cred` is not a standard or recognized directive in OpenLDAP for disabling anonymous binds.

`disallow bind_simple_unprotected` would disable simple binds over unencrypted connections, but not necessarily anonymous binds if other connection types are allowed.

`disallow bind_simple` would disable all simple binds, including authenticated ones, which is a broader restriction than just disabling anonymous access.