Which simplification of (a−3)2\sqrt{(a-3)^2}(a−3)2 is correct for ALL real values of aaa?
a−3a - 3a−3
∣a−3∣|a - 3|∣a−3∣
3−a3 - a3−a
(a−3)1/2(a-3)^{1/2}(a−3)1/2