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A spherical planet far out in space has a mass ${M}_{0}$ and diameter ${D}_{0}$. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to

(a) $G{M}_{0}/{{D}_{0}}^{2}$             (b)

(c)$4G{M}_{0}/{{{D}^{2}}_{0}}_{}$            (d)