Consider F and C below F(x, y, z) = yz i + xz j + (Xy + 42) k C is the line segment from (1, 0, -3) to (4, 5, 2) (a) Find a function f such that F-Vf. f(x, y, z) =|xyz + 2z" 2 (b) Use part (a) to evaluate Vf- dr along the given curve C. Enter an exact number.