Which of the following is an example of an event action?

The correct choice in this scenario is the action of connecting to a host. This action represents a specific step taken by a security professional or automated system in response to an event that has occurred within the network or system. It implies that someone is taking an active measure to further investigate or remediate a situation that has been identified, which is a fundamental component of incident response activities.

Connecting to a host is often essential for gathering additional information, executing commands, or deploying tools that are necessary for detection, analysis, or remediation of security incidents. When a security alert or suspicious activity is noted, one of the common courses of action is to connect to the host in question to understand the context and take further necessary steps.

In contrast, monitoring network traffic, running a full system scan, and analyzing malware signatures represent ongoing processes or specific analysis techniques rather than direct responses to an incident. They are important activities within a comprehensive security strategy but do not inherently qualify as immediate event actions, which are reactive responses to specific situations.