Which of the following switches for the ldapsearch command makes sure that search referrals are followed?

The `-r` switch is not a standard `ldapsearch` option for following referrals; it's often used for other purposes in various commands (e.g., recursive operations).

The `-C` switch for the `ldapsearch` command specifically instructs the client to follow referrals received from the LDAP server, allowing a search operation to transparently span across multiple directory servers in a distributed environment.

The `-S` switch for `ldapsearch` is typically used for sorting search results or specifying an authentication mechanism, not for following referrals.

The `-R` switch in `ldapsearch` is used to disable the automatic following of referrals, which is the opposite of the desired behavior.