Which of the following lines would an administrator find in the file /etc/resolv.conf?

The `order` directive is used in older resolver configurations or within /etc/nsswitch.conf to specify lookup order, not /etc/resolv.conf.

An entry like `192.168.168.4 dns-server` is a hostname-to-IP mapping, which belongs in /etc/hosts or a DNS zone file, not /etc/resolv.conf.

The `hosts` directive is part of /etc/nsswitch.conf, which defines the order of name service lookups, not /etc/resolv.conf.

The `domain` directive in /etc/resolv.conf specifies the default domain name that is appended to unqualified hostnames when performing DNS lookups. For example, if `domain mycompany.com` is set, a lookup for `server1` would attempt to resolve `server1.mycompany.com`.