State why Rolle's Theorem does not apply to the function f(x) = $\displaystyle \frac {2} {(x+1)^2}$ on the interval [-2, 0]

a) f is not continuous on [-2,0]

b) f(-2) not equal f(0)

c) f is not differentiable at x = -1

d) Both a and c

e) None of these