(1 point) For each of the following vector fields F, decide whether it is conservative or not by computing curl F. Type in a potential function that is, Vf = F). Assume the potential function has a value of zero at the origin. If the vector field is not conservative, type N. A. F (x, y) = (-14x +6y) i + (6x + 16y) j f(x,y) = f(x,y) = C. F f(x,y,z)= D. F (x,y)-(-7 sin y) i + (12y-7x cos y) j f(x,y) = E. F (x, y, z) =-7x21+6f1+822k f(x,y,z)= Note: Your answers should be either expressions of x, y and z (e.g. "3xy + 2yz"), or the letter "N