Pick out the correct statement.
(A) A forced vortex occurs when fluid rotates as a solid about an axis
(B) In laminar flow, Newton's law of viscosity does not apply
(C) A free vortex occurs, when fluid rotates as a solid
(D) In turbulent flow, there are neither cross-currents nor eddies
(A) A forced vortex occurs when fluid rotates as a solid about an axis
(B) In laminar flow, Newton's law of viscosity does not apply
(C) A free vortex occurs, when fluid rotates as a solid
(D) In turbulent flow, there are neither cross-currents nor eddies