(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 f (that is, â½f-F). If it is not conservative, type N f(x, y) = N f (x,y, z) = f(x,y) = f(x,y,z)= Note: Your answers should be either expressions of x, y and z (e.g. "3xy + 2yz"), or the letter "N'"