Let $$f : R \rightarrow R, g : R \rightarrow R$$ and $$h : R \rightarrow R$$ be differentiable functions such that $$f(x) = x^3 + 3x + 2, g(f(x)) = x$$ and $$h(g(g(x))) = x$$ for all $$x \in R$$. Then

A

$$g'(2) = \frac{1}{15}$$

B

$$h'(1) = 666$$

C

$$h(0) = 16$$

D

$$h(g(3)) = 36$$