Which statement best describes masking?

• A. Replacing a sensor without powering down
• B. It involves masking a password
• C. It involves masking labeling on devices
• D. When someone attempts to blind a sensor by placing objects in its field of view or by spraying it with paint

Answer: (D)

Masking means attempting to defeat a sensor by obstructing its ability to sense. In alarm systems, this is shown when someone physically blocks a sensor’s view or covers it with paint, reducing or hiding its detection capability. The scenario described—placing objects in front of a sensor or painting it to blind it—fits this idea exactly, because the goal is to prevent the sensor from triggering the alarm by masking its sensing path. Other options don’t involve obscuring the sensor’s ability to detect: replacing a sensor without powering down is about hardware change, masking a password is a digital security term, and masking labeling on devices is a labeling issue, not sensor obfuscation.