C. If F = (f (x, y, z), g (x, y, z), h (x, y, 2)) is a vector field such that f, g and h have continuous second partial derivatives on R3, then V . (V x F) = 0. d. If F = (F(x, y, z), g (x, y,z), h (x, y, z)) is a vector field such that f, g and h have continuous second partial derivatives on R3, then V (V - F) = 0.