How do passive security measures differ from active measures?

• A. Passive measures require ongoing monitoring; active measures are static.
• B. Passive measures are digital; active measures are physical.
• C. Passive measures are static (locks, barriers); active measures require ongoing monitoring or response (guards, alarms).
• D. Passive measures involve science experiments; active measures involve marketing campaigns.

Answer: (C)

The main idea is how security measures function in terms of action. Passive measures are built into the environment and work without requiring someone to act in real time; they create barriers that deter or slow intruders and protect you even when no one is actively watching. Examples like locks and barriers illustrate this well: they stay in place and do their job passively.

Active measures, on the other hand, depend on ongoing monitoring and a timely response when a threat is detected. This includes guards who watch for trouble or alarms and automatic alert systems that notify personnel to take action. They require action to detect, assess, and respond to incidents as they happen.

So the best description is that passive measures are static (like locks and barriers), while active measures require ongoing monitoring or response (guards, alarms). The other options mix up the concepts or introduce irrelevant distinctions (digital vs physical, or science/marketing contexts), which don’t capture the security-action difference.