Which choices are examples of open-channel flow? I. Flow of water in rivers II. Draining of rainwater

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Which choices are examples of open-channel flow?

I. Flow of water in rivers

II. Draining of rainwater off highways

III. Upward draft of rain and snow

IV. Sewer lines

(a) I and II 

(b) I and III

(c) II and III

(d) I, II, and IV 

(e) I, II, III, and IV

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