Let h(x)= (g o f)(x)= x^2 / x^2 + 1. Which of the following could be a possible decomposition of h(x)?


a. f(x)= x; g(x)= x / x + 1
b. f(x)= x + 1; g(x)= 1 / x^2
c. f(x)= x^2; g(x)= x / x + 1
d. f(x)= x + 1; g(x)= x^2