The acceleration due to gravity at height $$h$$ above the earth if $$h \ll R$$ (Radius of earth) is given by

A

$$g' = g\left(1 - \frac{h^2}{2R^2}\right)$$

B

$$g' = g\left(1 - \frac{h}{2R}\right)$$

C

$$g' = g\left(1 - \frac{2h}{R}\right)$$

D

$$g' = g\left(1 - \frac{2h^2}{R^2}\right)$$