For each of the following vector fields F , decide whether it is conservative or not by computing the appropriate first order partial derivatives. Type in a potential function J (that is Vf = F) with f(0, 0) = 0. If it is not conservative, type N. A. F(x, y) = (-6 - 3y)i + (-3x + 4y)j f(x, y) = B. F(x, y) = -3yi - 2rj f(x, y) = C. F(x, y) = (-3 siny)i + (-6y - 3x cosy)j f(x, y) = Note: Your answers should be either expressions of x and y (e.g. "3xy + 2y"), or the letter "N"