The velocity profile in an incompressible, laminar boundary layer is shown in the figure below. $U$ is the free-stream velocity, $u(y)$ is the stream-wise velocity component. The area of the black shaded region in the figure below represents the

(A) boundary layer thickness.

(B) momentum thickness.

(C) displacement thickness.

(D) shape factor.

The velocity profile in an incompressible, laminar boundary layer is shown in the figure below. $U$ is the free-stream velocity, $u(y)$ is the stream-wise velocity component. The area of the black shaded region in the figure below represents the

(A) boundary layer thickness.

(B) momentum thickness.

(C) displacement thickness.

(D) shape factor.

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