Question

fire alarm system
buildings often have a fire alarm system. it is designed to detect a fire and sound an alarm. the system consists of (among others):

• smoke detectors
• manual activation points
• led flashing lights
• sirens

if the alarm is activated, you are warned by sound and visual alarms to evacuate the premises.
false alarm
false alarms cause firefighters to respond for no reason. therefore, activating a fire alarm when theres no fire is a criminal offense, often punishable by heavy fines.
what should you do if the alarm is activated?
find the fire and start fighting it.
deactivate the fire alarm system.
evacuate the building and assemble outside.

Explanation:

The text clearly states that when the alarm is activated, you are warned by sound and visual alarms to evacuate the premises. Fighting the fire is dangerous without proper training, and de - activating the alarm instead of evacuating is incorrect as it's a sign to leave the building.

Answer:

Evacuate the building and assemble outside.