This item is best solved by thinking like an operator in Prism Central: first identify whether the problem is design, control-plane state, or policy logic, then pick the option tied to that layer. The correct response is B, meaning “Quarantine Policy”. An Isolation Policy is built to stop communication between defined groups. Unlike an application policy, it is intended to create a hard boundary, making it the correct choice when the requirement is “no traffic between these entities.” Quarantine is the fastest containment mechanism in Flow Network Security. It is specifically intended for suspected or compromised workloads that must be isolated immediately without redesigning broader application rules. This is a Flow policy design question, so categories, secured entities, rule direction, policy mode, and policy precedence matter more than simple IP connectivity assumptions. In other words, this is less about broad infrastructure suspicion and more about finding the exact Nutanix decision point that explains the behavior. Notice that A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. C does not fit because it targets a different layer of the Nutanix networking.