Determine the range of the function h(x)=4−x2−6x+9h(x) = \sqrt{4 - \sqrt{x^2 - 6x + 9}}h(x)=4−x2−6x+9.
[0,2][0, 2][0,2]
[0,4][0, 4][0,4]
[2,4][2, 4][2,4]
[0,4][0, \sqrt{4}][0,4]