The variation of a certain physical parameter Z with variable u is given by the relation $$Z = A\left(\frac{R}{R+u}\right)^3$$, where R and A are constants and the maximum value of u is much less than R. Then to find R, a student plots a graph of variation of Z, Y axis, against u, X axis. The graph is a

A

straight line passing through origin and slope = $$\frac{R}{3}$$

B

straight line with intercept $$\frac{3A}{2}$$ and slope = $$-\frac{R}{3}$$

C

straight line with intercept A and slope = $$-\frac{3A}{R}$$

D

straight line with intercept $$-\frac{A}{2}$$ and slope = $$-3R$$