If f(x)=xf(x) = \sqrt{x}f(x)=x and g(x)=x2−4g(x) = x^2 - 4g(x)=x2−4, what is the domain of f(g(x))f(g(x))f(g(x))?
[2,∞)[2, \infty)[2,∞)
(−∞,−2]∪[2,∞)(-\infty, -2] \cup [2, \infty)(−∞,−2]∪[2,∞)
[−2,2][-2, 2][−2,2]
(0,∞)(0, \infty)(0,∞)