Which of the following describes an effective reaction to a sudden threat?

Maintaining an appropriate reactionary gap is crucial when responding to a sudden threat. This concept refers to the distance between an officer and a potential threat that allows for adequate time to assess the situation and respond effectively. By keeping this gap, an officer can evaluate the threat without putting themselves in immediate danger, allowing for de-escalation tactics if possible or preparation for protection if necessary.

In contrast, other options may lead to increased risk or escalation of the situation. A relaxed posture could be misinterpreted as a lack of seriousness about the threat, which might embolden an aggressor. Engaging immediately with physical force without assessing the situation can escalate conflict and lead to unnecessary harm. Ignoring the subject's actions disregards the potential risk they may pose, thus compromising the officer's safety and the safety of others. Therefore, maintaining an appropriate reactionary gap is a critical strategy for effectively managing sudden threats.