Smoke sensors must be installed in the computer room.

NFPA 75 (Standard for IT Equipment Protection) and NFPA 72 (Fire Alarm Code) recommend installing at least one smoke detector per 250 ft² (≈25 m²) in IT rooms. This ensures early detection in high-value environments.

A and B are far too dense, exceeding NFPA minimums.

D is too sparse and would not meet early detection requirements.

Therefore, the correct standard density is 1 per 25 m².