3. Match the level curves with their functions:
(A) f(x,y) = 2x - 7y + 4 matches with
(B) f(x,y) = 3y + 4x^2 matches with
(C) f(x,y) = sin(y) matches with
(D) f(x,y) = (3/2)x^2 + xy + 2y^2 matches with
(E) f(x,y) = y^3 - 3 matches with
(F) f(x,y) = 4xy + xy matches with
Note: The symbols (v), (B), (C), (D), (F), and (E) are not necessary and have been removed for clarity.