Pick up the correct statement from the following ?

A. The minimum design velocity of sewer pipes is taken as 0.8 m/sec

B. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge

C. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge

D. All the above
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