An auditor discovered multiple insecure ports on some servers. Other servers were found to have legacy protocols enabled. Which of the following tools did the auditor use to discover these issues?

Nessus is a vulnerability scanner that identifies security weaknesses, misconfigurations, and known vulnerabilities on systems. It would effectively detect insecure ports (e.g., open ports that should be closed or are running vulnerable services) and the presence of legacy, insecure protocols. Curl is a command-line tool for transferring data with URLs and is used for interacting with web services, not for comprehensive vulnerability scanning. Wireshark is a packet analyzer used to capture and inspect network traffic, which could show traffic using legacy protocols but wouldn't actively scan for misconfigurations or open ports. Netcat is a networking utility for reading from and writing to network connections, often used for port scanning or creating simple backdoors, but it lacks the extensive vulnerability detection capabilities of Nessus.