Final answer:
Clark employed a comprehensive security suite or web application firewall that provides anti-fraud, anti-phishing services, application testing, and PCI scanning to improve the internet security for Censys Solutions.
Step-by-step explanation:
The tool used by Clark to enhance the internet security of Censys Solutions likely falls under the category of a comprehensive security suite or a web application firewall (WAF). Such tools typically offer a range of services that include anti-fraud and anti-phishing measures, as well as application testing and PCI scanning to ensure compliance with the Payment Card Industry Data Security Standard (PCI DSS). An example of this tool could be a cloud-based security platform that integrates multiple security capabilities in one solution to protect against various online threats and ensure secure transactions.