What is a visible and audible feature of the alarm panel?

The choice of "Normal" pertains to the condition of the alarm panel when it is functioning correctly and indicates that there are no active alarms or issues. In this state, the panel typically displays a steady green light or indicator, visibly signaling that everything is operating as it should. Additionally, it usually does not emit any alarm sounds, making it a silent but visible state, which can be confirmed by checking the panel.

In contrast, the other options represent different functionalities or states of the alarm system. "Manual Override" refers to a feature that allows users to bypass automatic settings and control the system manually; it does not inherently indicate a visible or audible status. "Standby" usually indicates the system is armed but not currently active or alarming, while "Quiet" would refer to a selective silencing feature that may mute any audible alarms but does not suggest a visible confirmation of the panel's status. Thus, "Normal" is the most appropriate choice as it reflects the typical state of the alarm panel in a clear and confirmable manner.