Final answer:
The correct answer is option A. Visual.
Step-by-step explanation:
Strobe lights fall under the category of Visual notification appliances. These devices are used to alert individuals visually in the event of an emergency, such as a fire. They are part of a building's fire alarm system, and their purpose is to provide a flashing light signal to alert individuals, especially those who are deaf or hard of hearing, to evacuate or take other necessary actions.
Textual, Conductive, and Addressable refer to other types of systems or features that might be incorporated into emergency notification systems but do not describe the visual nature of strobe lights.