The tool set described as 'Professional Toolset' for DNS tasks is:

The tool set described as 'Professional Toolset' for DNS tasks is:

• A. DNSstuff (Professional Toolset)
• B. IP2Location
• C. ARIN
• D. Thin Whois

Answer: (A)

For DNS tasks, you want an integrated set of tools that can handle lookups, DNS record checks, WHOIS, and health checks in one place. DNSstuff's Professional Toolset fits that description perfectly, as it’s known as a bundled suite of DNS utilities designed for administrators to perform comprehensive DNS diagnostics and research. The other options don’t describe a full DNS toolset: IP2Location focuses on IP geolocation data, ARIN is the registry that allocates IP address space, and Thin Whois is just a lightweight WHOIS client. So the described toolset aligns with DNSstuff's Professional Toolset.

For DNS tasks, you want an integrated set of tools that can handle lookups, DNS record checks, WHOIS, and health checks in one place. DNSstuff's Professional Toolset fits that description perfectly, as it’s known as a bundled suite of DNS utilities designed for administrators to perform comprehensive DNS diagnostics and research. The other options don’t describe a full DNS toolset: IP2Location focuses on IP geolocation data, ARIN is the registry that allocates IP address space, and Thin Whois is just a lightweight WHOIS client. So the described toolset aligns with DNSstuff's Professional Toolset.