Determine if the statements below are true or false. (a) The area vector A of a flat, oriented surface is parallel to the surface. True False (b) If S1 is a rectangle with area 1 and S2 is a rectangle with area 2, then 2 F · dA S1 = F · dA S2 . True False (c) If S is the unit sphere oriented outward and F · dA S = 0 then F (x,y,z) is perpendicular to x i + y j + z k at every point of S. True False