Which classification system in civil engineering primarily focuses on achieving high indoor environmental quality, reducing energy consumption, and minimizing the carbon footprint of buildings through strategies such as natural ventilation, daylight harvesting, and thermal comfort optimization?

a$)$ Passive House Standard

b$)$ NFPA $101($Life Safety Code$)$

c$)$ BREEAM $($Building Research Establishment Environmental Assessment Method$)$

d$)$ ASTM $($American Society for Testing and Materials$)$