Which of the graphs fig. represents correctly the variation of intensity of gravitational field I with the distance r from the centre of a spherical shell of mass M and radius a ?

The variation of intensity of gravitational field with distance r from the centre of spherical shell is given by Inside spherical shell $\mathrm{r} < \mathrm{I},\mathrm{I} \infty \mathrm{r}$Outside spherical shell $\mathrm{r}>\mathrm{R},\mathrm{I}\propto 1/{\mathrm{r}}^2$
This is represented by graph [d).