Which groups engage in illegal activities that threaten security?

The correct choice is the option that highlights "Criminal Elements." This group is specifically identified as engaging in illegal activities that pose a direct threat to security. Criminal elements can encompass a variety of individuals and organizations involved in activities such as trafficking, smuggling, cybercrime, and organized crime, all of which undermine national and personal security. Their actions can lead to the destabilization of societies and often intersect with larger security threats, including terrorism and espionage.

While other groups mentioned may influence security issues in various ways, they do not primarily engage in illegal activities that threaten security in the same direct manner. Technical experts may work within the bounds of law to enhance security measures, government officials are typically tasked with upholding laws and protecting national interests, and volunteers are generally engaged in lawful activities that support communities or causes. Thus, it is the criminal elements that represent the group most associated with illegal activities that threaten security.