Why is WHOIS pivot information useful in a Bulk Domain search?

The usefulness of WHOIS pivot information in a Bulk Domain search primarily lies in its ability to trace the ownership and registration details of a domain. WHOIS databases provide information about who owns a domain, including the registrant's name, organization, contact information, and the dates associated with the domain registration. This information is critical for cybersecurity investigations, as it allows analysts to establish connections between potentially malicious domains and their owners. By understanding who is behind a domain, analysts can identify threats, determine the legitimacy of a site, and follow up with further investigation if necessary. This kind of data is essential for threat intelligence and can support incident response efforts by providing insights into how a domain may relate to a broader range of security incidents.

The other options do not align with the primary focus of WHOIS information. Analyzing geographical locations or auditing software licenses would not typically involve domain registration data, and file encryption analysis relates to data security rather than domain ownership.