The distribution of shear stress in a stream of fluid in a circular tube is
(A) Linear with radius for turbulent flow only
(B) Linear with radius for laminar flow only
(C) Linear with radius for both laminar & turbulent flow
(D) Parabolic with radius for both laminar & turbulent flow
(A) Linear with radius for turbulent flow only
(B) Linear with radius for laminar flow only
(C) Linear with radius for both laminar & turbulent flow
(D) Parabolic with radius for both laminar & turbulent flow