What is the primary method used for detecting exploit kits?

The primary method used for detecting exploit kits is blocking connections to websites known to host exploit kits. This method focuses on proactive defense measures that identify and prevent access to malicious domains or URLs associated with exploit kits, which are often used to deliver malware to users.

By maintaining an updated database of known threats and categorizing them based on intelligence and reporting, security systems can effectively block these connections before any malicious payload can be delivered to potential victims. This is crucial because exploit kits often take advantage of vulnerabilities in software or browsers when users unknowingly access these compromised sites.

Monitoring user behavior on websites, scanning files for malware signatures, and analyzing network traffic patterns are all valuable security practices but serve different roles in the overall security framework. They can provide context and additional layers of defense, but blocking known malicious connections is a direct method of preventing the exploitation of users by denying access to identified threats. Thus, option B represents a critical frontline defense against exploit kits.