What mode do the VENs operate in for exceptions to deny during the ruleset journey?

The correct choice is Visibility Only or Selective, as it specifically refers to the mode in which the Virtual Enforcement Nodes (VENs) function when exceptions are being processed. In this mode, the primary focus is on collecting data and insights without enforcing strict policies, which allows for a better understanding of traffic flows and potential security issues.

This mode is especially useful in a ruleset journey when you want to analyze how the application behaves and identify the exceptions that should be handled without immediately blocking any traffic. It provides visibility into all kinds of traffic, allowing administrators to refine their security policies based on real data, before moving to a more restrictive mode that would actively deny or allow traffic based on the established rules.

In contrast, other modes such as Exclusive, Full Enforcement, and Allow imply a different approach to traffic management and security policy enforcement, where stricter rules are applied, and traffic may be actively blocked or allowed based on pre-defined settings. These modes do not support the necessary flexibility for analyzing exceptions during the ruleset journey as effectively as the Visibility Only or Selective mode does.