If f(x)=4−x2f(x) = \sqrt{4-x^2}f(x)=4−x2, what is the domain of f(x)f(x)f(x)?
(−∞,2](-\infty, 2](−∞,2]
[0,2][0, 2][0,2]
[−2,2][-2, 2][−2,2]
(0,2)(0, 2)(0,2)