The answer is: b. Deterring criminal behavior
In order to deter criminal behavior, government need to prepare a certain level of precautions in order to discourage the act of criminal behavior in a certain area.
This could be done through several methods, such as create a proper management in the department of justice, impose harsh punishments from criminal behavior in order to make people scared of doing it, or improving the economy to eliminate the needs to steals/rob in the first place.