All of the following statements are important strategic considerations for an offensive fire attack in commercial buildings and warehouses EXCEPT:

A) the most effective hose-line for a fire of any consequence in these structures is 1 ¾ -inch.
B) depending on the conditions found, both vertical and horizontal ventilation might be needed.
C) positive pressure ventilation may be effective if the building openings can be controlled.
D) anticipate the use of steel bar joists supporting the roof of a noncombustible building and an early failure if attacked by fire.

A