4. Which of the following statements best explains the priority behind integrating ventilation systems in fire safety design? 单项选择题

Ventilation systems primarily support cooling of electrical equipment to prevent overload during fire events.

Ventilation systems are used mainly to increase oxygen concentration so fires can be controlled more efficiently by firefighters.

Ventilation systems allow smoke to spread uniformly, reducing the likelihood of concentrated hazardous smoke zones forming.

Mechanical and natural ventilation systems remove smoke and heat, support extinguishment efforts, and help maintain clear escape routes by managing air pressure.