Which of the following protocol loggers is used to detect ping sweep?

lppi is not a recognized protocol logger acronym in standard network security tooling and does not correspond to any known logging utility for detecting ping sweeps.

pitl is not a recognized protocol logger and does not correspond to any documented tool used for detecting ICMP or ping sweep activity.

dpsl is not a recognized protocol logger acronym and does not correspond to any standard tool used for logging IP protocol traffic or detecting ping sweeps.

ippl (IP Protocols Logger) is a Unix/Linux daemon that logs incoming IP protocol connections and packets, including ICMP echo requests used in ping sweeps. Because it captures and logs ICMP traffic at the protocol level, security administrators can analyze its logs to detect systematic ICMP-based ping sweep activity. It is specifically designed to log low-level protocol activity that other application-layer loggers may miss.