Which of the following tools provides enhanced logging features for a system?

Rsyslogd is the correct choice for providing enhanced logging features for a system. It is a powerful syslog daemon that supports advanced logging capabilities, such as filtering, message rewriting, and the ability to send logs to remote servers. Rsyslogd can handle high volumes of log messages efficiently and allows for flexible configuration options.

In contrast, dmesg is primarily focused on displaying kernel-level messages from the ring buffer, relating to hardware and system events during boot and runtime but does not have extensive logging features like rsyslogd. Logrotate is a tool used to manage and rotate log files, helping to prevent them from consuming excessive disk space, but it does not itself enhance logging; it merely helps in handling existing logs. Iptables, on the other hand, is a firewall utility used to manage network traffic through filtering, rather than for logging purposes. Thus, rsyslogd stands out as the tool specifically designed for enhanced system logging.