Which of these is the correct integrating factor for (x+y2)dx+2xydy=0(x+y^2)dx + 2xydy = 0(x+y2)dx+2xydy=0?
μ(x)=x\mu(x) = xμ(x)=x
μ(x)=y\mu(x) = yμ(x)=y
μ(x)=ex\mu(x) = e^xμ(x)=ex
μ(x)=x2\mu(x) = x^2μ(x)=x2