Evaluate the line integral OF . dr by evaluating the surface integral in Stokes' Theorem with an appropriate choice of S. Assume that C has a counterclockwise orientation when viewed from above. C F = (x2 - y2, z2 -x2, y2 -z?) C is the boundary of the square |x| $ 28, ly| s 28 in the plane z = 0. Rewrite the given line integral as an area integral over the appropriate region of the xy-plane. (OF . ar = JJ ( D dA C R Evaluate the integral. OF . dr = (Type an exact answer.)