Which integral represents the arc length of y=x2y = x^2y=x2 from x=0x=0x=0 to x=1x=1x=1?
∫011+x4dx\int_0^1 \sqrt{1 + x^4} dx∫011+x4dx
∫011+4x2dx\int_0^1 \sqrt{1 + 4x^2} dx∫011+4x2dx
∫01(1+2x)dx\int_0^1 (1 + 2x) dx∫01(1+2x)dx
∫011+x2dx\int_0^1 \sqrt{1 + x^2} dx∫011+x2dx