Which of the following is true about the characteristics of laminar and turbulent flows in circular pipes, tubes, and hoses? Group of answer choices A laminar flow can be modeled as a series of concentric layers of the fluid sliding along each other A laminar flow has a parabolic shaped velocity profile A turbulent flow has nearly uniform velocity profile across most of the cross section The velocity at the pipe wall is always zero for both laminar and turbulent flows All of the above