Find the first and second derivatives of the function f(x) = x / (8x + 7) .
(a) f'(x) = 1 / (8x + 7) ², f''(x) = -16 / (8x + 7) ³
(b) f'(x) = 1 / (8x + 7) ², f''(x) = 16 / (8x + 7) ³
(c) f'(x) = 1 / (8x + 7) , f''(x) = -16 / (8x + 7) ³
(d) f'(x) = 1 / (8x + 7) , f''(x) = 16 / (8x + 7) ³