Which expression is equivalent to x4−y4x2+xy⋅xx2+y2\frac{x^4-y^4}{x^2+xy} \cdot \frac{x}{x^2+y^2}x2+xyx4−y4⋅x2+y2x?
x−yx-yx−y
x+yx+yx+y
x2−y2x^2-y^2x2−y2
x2+y2x^2+y^2x2+y2