Which integral represents the arc length of f(x)=x3f(x) = x^3f(x)=x3 from x=0x=0x=0 to x=2x=2x=2?
∫021+x3dx\int_{0}^{2} \sqrt{1 + x^3} dx∫021+x3dx
∫021+9x4dx\int_{0}^{2} \sqrt{1 + 9x^4} dx∫021+9x4dx
∫021+3x2dx\int_{0}^{2} \sqrt{1 + 3x^2} dx∫021+3x2dx
∫02(1+9x4)dx\int_{0}^{2} (1 + 9x^4) dx∫02(1+9x4)dx