What indicates that the VEN is functioning properly?

The indication that the VEN (Virtual Enforcement Node) is functioning properly is the presence of an established heartbeat to the Policy Compute Engine (PCE). This heartbeat confirms that the VEN is actively communicating with the PCE and is able to send and receive information necessary for maintaining network security policies. A stable connection and consistent communication are essential for the VEN to effectively enforce policies and monitor application traffic as intended.

The other choices do not reflect proper functionality of the VEN. An invalid activation code would prevent the VEN from being activated and connected to the PCE. If the VEN remains offline, it would indicate a failure in its operation and communication capabilities. Lastly, if users cannot access security features, it suggests that the VEN is not functioning correctly, as access to these features is contingent upon the successful operation of the VEN.