Identify the correct definition of gravitational potential at a point. (A) it is defined in term...

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Identify the correct definition of gravitational potential at a point.
(A) it is defined in terms of the force required to displace a unit mass from infinity to that point
(B) it is defined in terms of the force required to move a unit mass from the surface of earth to that point
(C) it is defined in terms of the force required to displace a unit mass from that point to infinity
(D) none of these
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