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 f (that is, ∇f=F ) with f(0,0)=0. If it is not conservative, type N. A. F(x,y)=(−10x+y)i+(x+4y)j f(x,y)= B. F(x,y)=−5yi−4xj f(x,y)= C. F(x,y)=(−5siny)i+(2y−5xcosy)j f(x,y)= Note: Your answers should be either expressions of x and y(e.g."3xy+2y"), or the letter "N"