The normal stress is the same in all directions at a point in a fluid, only when the fluid
(A) Is at rest & has zero viscosity
(B) Is frictionless
(C) Fluid layer has no motion relative to an adjacent layer of fluid (D) is incompressible & frictionless
(A) Is at rest & has zero viscosity
(B) Is frictionless
(C) Fluid layer has no motion relative to an adjacent layer of fluid (D) is incompressible & frictionless