Three alarm types: which statement is true?

• A. Audible, Automatic, Visual
• B. Audible
• C. Automatic
• D. Visual

Answer: (A)

Alarms are designed to alert people through multiple channels, using sound, light, and automatic triggering. The statement that lists Audible, Automatic, and Visual covers all the common ways an alarm can operate: audible alerts produce a sound to draw attention, visual alerts use lights or strobes for those who might not hear the alarm, and automatic refers to triggering the alarm without someone having to activate it manually, typically via sensors or preset conditions. Because this option includes all three modalities, it accurately reflects the full set of alarm capabilities. Choosing just Audible or just Visual, for example, omits the other valid modalities and isn’t as complete.