Which expression represents the arc length of f(x)=x2f(x) = x^2f(x)=x2 from x=0x=0x=0 to x=2x=2x=2?
∫021+4x2dx\int_{0}^{2} \sqrt{1 + 4x^2} dx∫021+4x2dx
∫021+x2dx\int_{0}^{2} \sqrt{1 + x^2} dx∫021+x2dx
∫021+2xdx\int_{0}^{2} \sqrt{1 + 2x} dx∫021+2xdx
∫02(1+4x2)dx\int_{0}^{2} (1 + 4x^2) dx∫02(1+4x2)dx