(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 C. F (x, y,z--8ri-7yi+k f (x, y, z)--4x^2-(7/2)y"2+z --82,21-2y"j + 832k E. F (x,y, z) f(x,y,z)- Note: Your answers should be either expressions of x, y and z (e.g. "3xy + 2yz"), or the letter "N"