Which term best describes the actions taken to protect against terrorism?

Antiterrorism is the term that best describes actions specifically taken to protect against terrorism. It encompasses a wide range of defensive measures intended to prevent terrorist attacks, safeguard individuals, and secure infrastructures from potential terrorist threats. This can include physical security measures, policies, and procedures designed to deter and mitigate the effects of terrorism.

Understanding antiterrorism is crucial in the context of protecting communities and nations. It not only addresses the immediate security concerns but also helps to foster resilience against the broader implications of terrorism. Effective antiterrorism strategies can include training personnel, hardening targets, and implementing surveillance systems.

The other terms, while related to the overall goal of combating terrorism, do not specifically represent the protective actions aimed at preventing attacks. Counterterrorism generally refers to the offensive measures taken by military or law enforcement to respond to terrorism after an attack has occurred or to eliminate terrorist threats. Reactant measures suggest a response after a threat is identified, which does not align with the preventive focus of antiterrorism. Proactive strategies could imply planning and preparation but can be broader and not solely limited to the context of terrorism. Thus, antiterrorism most accurately encapsulates the proactive protective measures against terrorism.