Pick out the correct statement pertaining to Venturimeter ?

A. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when

B. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically

C. nward, than when the flow is vertically upward

D. The co-efficient of contraction of a Venturimeter is always unity

E. None of these

F. pressibility is taken into account, than when it is neglected

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