18. Let S be the part of the plane x = y + z that lies inside the cylinder y2 + 22 = 4. Calculate (J SF . n dS for F(x, y, z) = (y' + z2, 7y, -7y) with S oriented by the normal that points in the positive +x direction. 167 A. 3 B. -87 C. 8T D. 3 E. 167