An administrator needs to make a web server VM, which is inside a private VPC...

What makes this a strong certification question is that several answers look technically related, but only one aligns with the exact behavior of Flow networking or Flow security. The correct response is B, meaning “The VPC has no default route configured to use the external subnet.”. A Floating IP is the normal mechanism for exposing a workload in an overlay-backed VPC to external clients. It preserves internal VM addressing while publishing a reachable external address through the VPC’s north-south path. Operationally, Flow Virtual Networking should be checked from the control plane outward: gateway health, peering state, route advertisement, ERP coverage, external path, and MTU when encapsulation is involved.

Notice that A addresses exposure of a single VM, not the broader routing or security behavior under discussion. C is a disruptive action and does not address the actual control-plane or policy requirement being tested. That is the underlying Nutanix principle being validated: solve the issue at the feature that owns the behavior, not by changing unrelated infrastructure settings that happen to sound network-oriented.