Pick up the incorrect statement from the following regarding fire hydrants

• A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
• B. The minimum water pressure hydrants, is kept 1.5 kg/cm2
• C. The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
• D. None of these.