Which of the following tools is described in the statement given below? "It has a database containing signatures to be able to detect hundreds of vulnerabilities in UNIX, Windows, and commonly used…

SARA (Security Auditor's Research Assistant) is a vulnerability scanner but has a narrower scope and is not known for DDoS zombie or Trojan detection via a signature database.

Nessus, developed by Tenable, is a comprehensive vulnerability assessment tool that maintains a large plugin-based signature database used to detect thousands of vulnerabilities across multiple operating systems including UNIX and Windows, as well as web CGI scripts. It also includes checks for DDoS zombie agents and Trojan backdoors. This combination of broad platform coverage and malware detection matches the description precisely.

Anti-x is not a recognized standard vulnerability scanning tool associated with the described signature-based detection capabilities for UNIX, Windows, CGI, and DDoS zombies.

Nmap is a network discovery and port scanning tool, not a vulnerability scanner with a signature database for detecting CGI flaws, Trojans, or DDoS zombies.