$2.)$ We know the energy grade line $($EGL$)$ and hydraulic grade line $($HGL$)$ for a flow system, shown below, but we don't know what the system itself actually looks like. In the diagram of the EGL and HGL below, do the following:

a$.(10$ points$)$ Classify each of the $5$ points indicated in the system $($A$,B,C,$ D$,$ and E$)$ as one of the elements listed below, based on your assessment of what is most likely to be there. Note that some of these options may appear more than once, or not at all:

A reservoir open to the atmosphere

A pipe with a constant diameter

A pipe with a diameter that is increasing in the direction of flow

A pipe with a diameter that is decreasing in the direction of flow

A pump

A turbine

b$.(3$ points$)$ Sketch a system that could satisfy all the conditions suggested by the EGL and HGL$.$ Focus especially on sketching appropriate pipe diameters, consistent with the flow velocities suggested by the grade lines.

A