Working at a company, you are asked to enhance security. In the interview, you were told to outline the strategy that you would choose to employ. Your answer broadly defined defensive measures into three categories: defensive, deterrent, and preventative. Fast$-$forward two months, and you are putting up signs around your company building warning of a patrolling guard. The use of a sign to warn people away from engaging in an unwanted activity is an example of which of the following categories?

$1$ point

Deterrent

Preventative

Detector

Firewall