According to Godrich the ratio of peak demand rate to mean demand is

• A. <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-1.png">
• B. <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-2.png">
• C. <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-3.png">
• D. <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-4.png">
• E. All the above.