Which online service is named for discovering subdomains?

• A. Sublist3r
• B. Pentest-Tools Find Subdomains
• C. DNSdumpster
• D. ThreatCrowd

Answer: (B)

The main idea here is recognizing naming that clearly signals the tool’s purpose. The best choice is the online service whose name literally says “Find Subdomains.” That explicit wording points directly to subdomain discovery as its primary function, making it the most direct and unambiguous fit for the question.

Other options can perform subdomain-related tasks, but their names don’t explicitly declare subdomain discovery. Sublist3r suggests subdomain enumeration, DNSdumpster is a DNS reconnaissance tool, and ThreatCrowd is a broader threat-intelligence platform. Their names don’t state that their main purpose is finding subdomains, so they’re not as direct a match as the one that includes “Find Subdomains.”