Which of these is the correct integral for the arc length of y=x2y = x^2y=x2 from x=0x=0x=0 to x=1x=1x=1?
∫011+4x2dx\int_0^1 \sqrt{1+4x^2} dx∫011+4x2dx
∫011+x4dx\int_0^1 \sqrt{1+x^4} dx∫011+x4dx
∫011+2xdx\int_0^1 \sqrt{1+2x} dx∫011+2xdx
∫011+4x4dx\int_0^1 \sqrt{1+4x^4} dx∫011+4x4dx