Answer: All of the above.
Explanation: Every single artist does not have the same reason for choosing to make it.
A relief sculpture can be seen from A. ONE point of view.
Relief means "to raise". Relief is a sculptural technique wherein a part of a medium is raised to while still connected to the medium.
It is seen from only one vantage point but may present multiple vantage points.
I think it might be melodic but my skills aren’t the sharpest..