What is the name of the Whois service that stores only the registrar's Whois server name?

• A. Thin Whois
• B. Full Whois
• C. Registrar Whois
• D. Whois History

Answer: (A)

Thin Whois is the Whois service model where only the registrar’s Whois server name is stored at the registry, with the registry providing a referral to the registrar for the full record. This keeps the registry’s data minimal and points users to the registrar’s server to retrieve detailed information. The concept hinges on how data is distributed between the registry and the registrar: in Thin Whois you don’t get the full registrant details from the registry itself, you get a pointer to the registrar’s server, which houses the complete data. The other options describe different approaches or tools: Full (Thick) Whois stores registrant details at the registry; Registrar Whois refers to the registrar’s own query service, not the registry’s thin model; Whois History is a separate service that tracks changes over time.