Answer :
The boundaries that are the basis of the median line principle are generally associated with the water bodies. Hence the option D is correct.
What are boundaries?
The boundary is something that divides or separates the two places or fronts from the meeting point.
The boundary may be physical, political, social, economic, cultural, etc. The boundary can be said to be an invisible line that marks the state or territory. The boundary of water such as ocean, sea, and lake follow the principle of the median line.
Find out more information about the Boundaries.
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