Pick out the wrong statement?

A. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance

B. The form drag is dependent upon the occurrence of a wake

C. An ideal fluid is the one, which has negligible surface tension and obeys the Newtons law of viscosity

D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

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