(x+3x+y) dx + exy dy = 0 Begin by separating the variables. Choose the correct answer below. x+3xy A. dx +3 ets ST OB. 1+ 3y dx = +8 ets dy C. 1+3y40 dy= sta dx D. The equation is already separated. An implicit solution in the form F(x,y) = C is =C, where C is an arbitrary constant. (Type an expression using x and y as the variables.)