Which of the Following Is True

Multiple Choice

Which of the following is true?

A) A streamline can only be defined for irrotational flow.
B) A streamline cannot be defined for turbulent flow.
C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow.
D) A streamline is the path that a tiny element of fluid would take as the fluid flows.
E) The velocity vector of a fluid element is always perpendicular to the streamline.