If $f(x)=(1-x)^{-1},|x|<1$ then the value of $\frac{f^{\prime i}(0)}{f(0)}+\frac{f^{i i \prime}(0)}{f^{i}(0)}+\frac{f^{i r}(0)}{f^{i i}(0)}+\ldots+\frac{f^{n+1}(0)}{f^{n-1}(0)}$ is
(a) $\frac{n(n+1)(n+2)}{3}$
(b) $\frac{n(n+1)(2 n+1)}{6}$
(c) $\frac{n(n+1)(n+2)}{6}$
(d) None of the above