The annular space between two co-axial vertical cylinders, of equal length, is filled with an incompressible liquid of constant viscosity. The outer cylinder is held fixed and the inner cylinder is slowly rotate about its axis at a uniform rotational speed. Assuming that Newton’s law of viscosity holds good
(A) The tangential velocity of liquid varies linearly across the gap
(B) Viscous shear stress in liquid is uniform across the gap
(C) The tangential velocity of liquid varies non-linearly across the gap
(D) Viscous shear stress in liquid varies linearly across the gap